Leosghost - 11:40 pm on Apr 30, 2011 (gmt 0)
There are a lot of folks who have spent the last 2 months denying #2 and #4 ..to the point where it was not worth my time repeating them as being major factors in many cases..and that "preview" was a foretaste of them "Google" looking at what visitors saw.
Hopefully you'll have better luck than I did .. and the thread can run without getting sidetracked with "It can't be ads, because all websites run ads..etc"
or "Google is broken"...etc etc.
It is important to have someone that is not biased review your site. So many websites I have reviewed the owner swears up and down he/she has no idea why there "extremely high quality and unique website" was hit, then when I take a look I can spot many suspicious practices almost instantly.
A definite +1 for that .and I would add, tested for usability too and overall impression, look , and feel .