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We did some experiments:

One website was #1 for certain keyword for one location. Then we created different website for for same industry in different locality. We linked from main website to new website and surprisingly for same keyword the new website did show up on the first page even though it is more difficult locality to grow in.

What I'm trying to say if there is new domain perhaps it won't be bad idea to put a link to new website from Main site. Of course it is up to you.

According our experience it is good to have one main domain and all other domains redirected to main. The reputation of the main domain should be growing faster instead of splitting all reputation to both domains.

You can look into Canonical URL's. As per our experience it does help a lot.

As per our experience "who is" information is being crawled. If there is no information (private) it should not have additional effect. (not sure about having negative effect if it is private though).

To have a link to valuable resource from own website should not be bad idea.

As per our experience, results in google can be seen fairly quickly couple weeks however bing and yahoo probably takes 3-4 times longer.

We are using Canonical URL's to avoid the issue

It should not have negative impact. Search engines just being adjusted and their info are being updated. Of course it is best to have best title.

I did some experiments with new websites and could bring them to first page but then the dropped quite a bit. Most likely it is some sort of spike which I've read about. It does happen sometime with some of our older websites too.
please make sure that you are not logged in in your google account it might change results.

In our experience: if link is coming from the website with BAD reputation it is better not to have it (even with good anchor text) However if it is neutral website with GOOD reputation (even if it is not in the same industry) we don't mind to have link from them with RIGHT anchor text.

I hope it helps and of course it is up to you to decide to get this links or not. Good luck.

Sometime keyword research tools show that there are not to many people are looking for certain keywords, but it doesn't mean that this keywords are bad. It is probably recommended to optimize for the keyword "Babe Ruth Posters" however it is not bad idea to optimize for two other keywords phrases too, they have main keywords in it too.

As well I noticed that sometime some of my clients coming up with keywords which are "not known" by keyword tools but even though they are being used.

Optimization of each page according the content is good idea. If it is "winning" poster then it is winning poster. Especially if you have separate section or product with word "winning" in it it will be recognized. Of course all optimization and decisions are up to you.

Creating separate websites is time consuming but as per our experience it was worth it. We had the client who wanted to open two new locations in two other cities.

1. We tried to add other city location to the contact page and for every location listing in google maps added same URL for our main website. Result was the website instantly lost the ranking for first and main city it went from 6 to 20. It took a lot of time to recover.

2. The we decided to buy separate domain for each of the locations and from main page just linked to other city pages. The link was from same industry (which is great) and it didn't hurt main website because we don't have there any information with addresses in other cities. Of course had to put new urls to google maps. Both new websites did grow quite quickly. Yes it was time consuming.

Of course it is up-to you to decide, just thought that it would be good to share our story.

You can look into Canonical URL's. As per our experience it does help a lot.

In our experience: if link is coming from the website with BAD reputation it is better not to have it (even with good anchor text) However if it is neutral website with GOOD reputation (even if it is not in the same industry) we don't mind to have link from them with RIGHT anchor text.

I hope it helps and of course it is up to you to decide to get this links or not. Good luck.

Nothing is for sure, but in my experience keywords in URL help, however very long URL's are probably not recommended. I've heard that keywords in domain names are not so valuable as before (they still are valuable just not so much). I tested keywords in URLs and one of the website were coming above the other website for the keywords. Again every case is different and it is solely your decision.

As per our experience "who is" information is being crawled. If there is no information (private) it should not have additional effect. (not sure about having negative effect if it is private though).

According our experience it is good to have one main domain and all other domains redirected to main. The reputation of the main domain should be growing faster instead of splitting all reputation to both domains.

We did some experiments:

One website was #1 for certain keyword for one location. Then we created different website for for same industry in different locality. We linked from main website to new website and surprisingly for same keyword the new website did show up on the first page even though it is more difficult locality to grow in.

What I'm trying to say if there is new domain perhaps it won't be bad idea to put a link to new website from Main site. Of course it is up to you.