Just saw “Adsense For Domains” link in my adsense reports today. Those Indian publishers who were desperately waiting for this announcement with hundreds of domains in your kitty, your time has arrived.
This online free service lets you know about other websites that are hosted on the same web-server as your site – using reverse IP check. To start checking simply, enter your site name and hit ‘Check’. You will see all shared sites on one page. Check out alexa and or traffic stats of those sites. If their traffic stats makes you feel they might be the culprit, ask your host to move onto some other less cloggy server
Sharing SEO and web design related points, I consider of utmost importance. Google site reconsideration