Check out this link -- this goes back to something Ive said a long time ago. Everything counts when you create your site of course but lately the domain name has a major pull in your popularity.....
Check out what they said...
Friday, August 20, 2010 at 9:40 AM
Webmaster Level: All
Today we've launched a change to our ranking algorithm that will make it much easier for users to find a large number of results from a single site. For queries that indicate a strong user interest in a particular domain, like [exhibitions at amnh], we'll now show more results from the relevant site:
Prior to today's change, only two results from www.amnh.org would have appeared for this query. Now, we determine that the user is likely interested in the Museum of Natural History's website, so seven results from the amnh.org domain appear. Since the user is looking for exhibitions at the museum, it's far more likely that they'll find what they're looking for, faster. The last few results for this query are from other sites, preserving some diversity in the results.
We're always reassessing our ranking and user interface, making hundreds of changes each year. We expect today's improvement will help users find deeper results from a single site, while still providing diversity on the results page.
** There are about 8 other things you need to do but this is one sure step in the right direction