A couple years back when I was just getting heavily into Internet Marketing, I purchased a couple of domains that had keywords in their title but had .info and .ws endings. I really didn't think it would matter all that much in terms of the sites being successful.
After I bought the domains and started working to boost them in the search engines I mentioned them to a few members of WF and some other internet marketers. Many people said that they would never really rank that high.
I'm glad I didn't believe them because here's what I've discovered.
1. Matt Cutts of Google says the domain endings have next to nothing to do with the way web pages are ranked. He may or may not be telling the truth and...
2. My .info domain is now ranked number 1 for 3 keywords. One of them is "buy xxx," which means I'm making a lot of sales on that site. The sites below mine include two .orgs and Amazon.com itself.
3. My .ws domain is currently #2 in Google for my main Keyword. Above and below are .coms
The secret to this is simple I think. I post quality original content on both of these sites and build links to them at the rate of 10-20 per week.
By the way both sites are PR 4 and have many pages within them that are PR 3. And both were purchased just a little over 1 year ago.
So, I'm here to say that in terms of ranking in Google, the domain ending doesn't matter as long as you have the right links and quality content.
Hope this post can help anyone confused over the topic.