Mm... I've noticed the effects as well - fortunately my
PR has stuck at 3, but Google has dropped quite a lot of my pages (gone from around 200 listed pages to just 3!)
I have emailed Google to check that my site hasn't been penalised, and the response was indeed that my site hasn't been penalised. According to the Google cache tool (
www.yourcache.com) at some datacenters my site has "-1" pages cached - hmmm....
Meanwhile, my MSN, Altavista, and Yahoo search engine saturation continues to rise... maybe I'll be totally reliant on those soon...