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Search engines aren't good at completing online forms (such as a login), and thus any content contained behind them may remain hidden, so the developers option sounds like a good solution.

You may want to read:

http://www.seomoz.org/beginners-guide-to-seo/why-search-engine-marketing-is-necessary

Sorry to hear about your troubles. From my understanding google puts more emphasis on contextual links that point to your site, where as Bing and other search engines will look more at your on page SEO, which looks good from what I can see for zombie games.

The only thing that I see right away is that zombie games is not in your URL, which would help you rank for that key word. The issue you face to me would be either to put more effort into building backlinks to your home page for zombie games, or to create a subdomain or another page with zombie games in the URL:

zombiegames.killthezombies.com or killthezombies.com/zombiegames

Which actually might be over kill I try not to repeat terms in the URL as it looks spammy to me maybe:

games.killthezombies.com or killthezombies.com/games

If you're not showing up in the top 100 this would be the tactic I would choose, but this would be like starting from the beginning and you would have to build links back to this page to really complete with other sites ranking for that keyword.

Just because your site has more links, a higher domain authority, and other competitive factors does not mean you will out rank other sites in search engines.

What you should do is a on page analysis of your competitor, for the page that they out rank you for in the SERP, and then do the same for you page that shows below theirs. Compare the two, and see who has the better grade. It sounds as though they have better on page SEO for that Key word.

If the results come back the same then they are a lot of other factors that could be causing them to rank above you. Like better off page SEO or a lower bounce rate.

From my understanding subdomains are considered completely separate from root domains unless you have a 301 redirect or conical that tells search engines you want them to consider the root or the subdomain to be the same; for example, http://www.yourdomain.com (subdomain) points to http://yourdomain.com

Therefore, you could have a subdomain out rank a root domain, or in your case a root domain penalized and the subdomain continue to rank well. The fact that they share an IP address shouldn't affect all the domains under that IP as many websites are on shared hosting which use the same IP address.

There are a few ways of doing this and it depends on how your website is set up, for example, you could do a 301 redirect in your htaccess file something like:

Standard 301 Redirect for Permanent Changes

redirect 301 /old-page.html http://www.example.com/newpage.html

You can add a canonical link in your head like:

If you're using wordpress it makes doing this a lot easier.

I would add rel="nofollow" to most or all of them, and/or add a site map link to the footer and place all of those links on a sitemap page.

The nofollow is best used for links that link to sites you don't want to give credibility to, and the site map should be for internal links.

You should change it, I'm no canonical expert, but the whole point of having it is to tell google how you want it to show, ex. www.yoursite.com or yoursite.com. If your not going to change it for all of your pages then at least do it for your home page as this is the one that usually gets the most attention.

I don't work for SEOmoz, so I can't say exactly why they do what they do, but as far as I know the canonical tag would be used on the index page of their site. As this is where it would be need to let google know if it's www.seomoz.com or seomoz.com.

As far as the pagination it's sounds like you answered that already, trying to stop duplicate content from being indexed. The same with noindexing the show post pages.

There are a couple of reasons the content on your page might not match your keywords, if someone comes to your site and aren't finding what they're looking for then they're going to bounce!

Also, you might want to engage the viewer some more add a video, images, or a slide show.

I'm looking into doing this as well.

The best way is to have the content translated by a professional, I would suggest using Odesk, this way you're getting an accurate translation. The only issue I can think of with doing this is that if you're targeting certain keywords they might not be what people are searching for in the language that you translate to. Also, the cost of doing it this way can add up.

The Alternative would be to use a translation program/plug in to do this for you.

I suggest getting it translated by a professional as this way you know that your articles aren't going to insult anyone.

If you have Google Webmaster Tools installed on you old domain then you can inform Google that you're moving domains, and then you can do a 301 redirect.

If you're doing a 301 redirect with no preservation of the entire site, this means that every page on the site will redirect to your 4th site,  then it won't matter if you delete the links in the images as the pages those links will now forward to your 4th site.

Or you can have the 301 redirect preserve you requests, this means that a user asking for /best-shoes.html on your old site will still see best-shoes on your new site.