My blog is hosted on a shared server (Ipage.com) and I also have a few small sites hosted on the same account. I recently used the Reverse IP Lookup tool from DomainTools.com and found that there are more than 2,000 domains hosted on the same IP. I was wondering, if Google finds that my site is hosted on a server with thousands of other sites, on the same IP, my site will appear lower on search result pages? Is there any evidence of this happening?