garyl2k - 5:58 pm on May 5, 2010 (gmt 0)
Here is some information from one of my sites, just so you know I'm no SEO expert so forgive me if I don't give in-depth details.
Anyway, my site has been ranking pretty well for a single short keyword for around 2 years now, last time Google did any major changes I did drop a few places in the SERPS and traffic was dented a tad.
Though since the 20th of April things have been going mental, I was placed on 2nd page and traffic dropped loads. Though, I put this down to an Algo change by G and expected things to settle down within a few days.
On the 27th things went back to normal, in fact better, I was in 2nd place for my keyword and was getting good traffic again. In fact my long tail keywords was also getting better rankings and I was getting loads more traffic then normal.
Now on the 3rd of May it all went down hill again, traffic has almost vanished and I'm back on 2nd page again...
I'm getting the same results as some people here, I find that at times I get "Two" different search results on same PC. I made sure cache was clear, DNS was cleared and wasn't logged into any Google accounts...
Though latelly I'm not seeing the 2nd search result as much, hope this ain't the final version of Google!
To me it seems like they are testing something out, one minute its on, next it's off, then on etc...