1. What would be the best practice to not have duplicate content errors with products that are listed on both sites? Should we rel-canonical items shown on both domains or do something else?

This depends largely on what type of website you currently have. Are you using a content management system? Is it all HTML? What do plan to build the letter? There are quite a few things you can use to prevent duplicate content errors

Yoast WordPress SEO

Plug-in comes to mind is something that get you through a lot of duplicate contact every day however I don't know what you say the site is made of so I can't really tell you for certain what's very effective on yours.

I would say start off with a good developer that will not create duplicate content issues the first place.

Your recommendation would be Greg

http://www.gregreindel.com/

2. We are not against having the new site be crawled, but will Google be upset/ding rankings because pricing is behind a log-in? Are there certain best-practices for B2B e-commerce sites?

The login page is just one page. You will not block the website's pages that are of value that come after the pages been logged in. For instance you can have a indexable website page with a

Login right there on the site itself it will then go through a process where it will not be accessed by anyone but members but you can indexes but I assure you

Using

http://getpremise.com/

or

http://www.woothemes.com/woocommerce/

Will serve your needs very well if you're using WordPress I love her I don't know you site.

3. Do you know of any other sites that have done this/do you have any recommendations on how to best implement this?

Very many sites of done this you are simply adding a members only site for your B2B customers you do not want the average Joe off the street trying to get it is a more closely knit group that probably pays a lot more money to you. You could do this with both woo commerce or getpremise.com

Both of them are WordPress plug-ins. I believe that a use of the premise plug-in along with your members being added and given a registration name will not cause an issue whatsoever.

I would build this out of WordPress however it is something I am very comfortable with and the site architecture I prefer.

When using WordPress I always suggest using to manage WordPress hosting company may I suggest WP Engine, ZippyKid, web synthesis, Pagely  & Presslabs.

Those are all manage WordPress hosting companies if you want something for hosting that does not do 100% word press I would strongly suggest using FireHost

I hope this is better talk to you

Sincerely,

Thomas

Sorry I just saw this

Sorry I did not see tthis yes one dose all auto and studio press makes the best if you ask me

If you buy http://my.studiopress.com/themes/agentpress/agentpress it cost $25 more then the normal non MLS but its ggreat use a host like Zippykid it will pay for it self

While other solutions either frame in the MLS content from another domain or charge you tens-of-thousands of dollars for a website you'll never own or fully control, dsIDXpress is different. In a nutshell, dsIDXpress allows you to display search-engine-indexable content for the properties in the your MLS on your own WordPress blog / website and on your own domain name. The content for the lists of properties and property details can be accessed via URLs on your blog (ex. www.yourblog.com/idx/city/los-angeles/) or via our Live Listings℠ shortcode functionality.

With dsIDXpress, the listing data never gets stale since it's all maintained by and resides on our own servers. You'll never have to worry about showing inactive or outdated listings on your website since our system automatically takes care of all of the feed updates from each MLS. In fact, ALL of the data displayed is never more than 24 hours old and is often never more than 2 hours old (depending on MLS policies)!

The bread-n-butter of dsIDXpress resides in its ability to display dynamic content from the MLS on virtual pages within your blog. The lists of properties and property detail view content is loaded based on the URL that's loaded (just like a normal post / page), so when you link to yourblog.com/idx/city/los-angeles or yourblog.com/idx/mls-12345-, the active listings for Los Angeles or the data for MLS # 12345 is displayed on your blog and on your domain WITHOUT the use of iframes or anything else that would raise flags in search engines. The data is ALWAYS up to date, leaving you free to do things other than maintain the MLS data on your site.Our Live Listings℠ shortcodes allow you to actually embed data for either an individual listing or a group of listings into any blog post or page you create. We currently provide two shortcodes, our [idx-listing] shortcode for posting a specific property in a post / page, and our [idx-listings] shortcode for posting a group of properties into a page. The data displayed with the Live Listings℠ functionality is automatically updated every few hours on your blog, allowing you to write about properties or publish content pages containing properties without ever worrying about the data getting stale.

The [idx-listing] shortcode will display a configurable amount of data for any active listing in your MLS based on an MLS number you provide. A good time to use this shortcode would be when a seller's agent signs a new property and wants to talk about that listing on their blog. In the past, that agent would have had to create a page for each of their listings and then update the data in both the MLS and on their blog every time they wanted to change the price, fix a typo, add new information, etc. With dsIDXpress, the agent can simply place [idx-listing mlsnumber="12345" showpricehistory="true" showlocation="true"] into their blog post or page to show all of the essential details, the price history, and the location (on a map) for MLS # 12345. As pointed out before, ALL of the details for that property will stay updated for as long as that page exists and as long as the property is an active listing.

The [idx-listings] shortcode will display a group of properties matching any criteria you specify. This functionality can be used to provide content for any area pages you create. For example, if you were to create a page on the Belltown community in Seattle, you might normally end up writing a couple of paragraphs about that community and then link to the IDX / MLS search for that area. Using dsIDXpress, you can easily add [idx-listings community="Belltown" orderby="DateAdded" orderdir="DESC" count="10"] to the bottom of your blog post to show the 10 newest listings in that community. The data displayed by that shortcode will stay updated as long as that page is in your blog.

While the Live Listings℠ shortcodes are fairly easy to understand when you look at them, we realize that trying to remember all of the different options for each shortcode can be difficult. That's why we integrated the Live Listings℠ functionality into the HTML page / post editor that you're already used to. Simply click on either of the new dsIDXpress icons in the editor, and you'll be greeted with an extremely simple Live Listings℠ insertion tool that will let you insert a single listing or a group of listings with ease.

dsIDXpress provides three different widgets that can be integrated into the blog it's used on. The widgets provide an excellent starting point for getting the MLS content on your blog, in front of the eyes of your visitors, and indexed in search engines. The dsIDXpress widgets are just as easy to use as WordPress's normal widgets; simply open the widget area, drag / drop it to where you want it, and quickly configure it to do what you want it to do. Easy!

The IDX Search widget allows your visitors to quickly search for active listings in the MLS from your sidebar. This widget isn't meant to be a fully-fledged IDX as much as it's meant to be a teaser to pique your visitors interest in the data on your website.

The IDX Listings widget shows a configurable number of listings in a customizable display format based on criteria your define. Whew! This widget can be used to display your own listings on a map, your office's listings in a slideshow, the details and photos of most expensive homes in the city, or just recent listings of a certain community on a map.