I have no messages in webmaster tools to say so but until around 7/8 week ago I was ranking number 1 for around 6 months or so for 2 keywords which are both very similar (in fact ones just got 'buy' in front of the main keyword). I now rank 11 for the buying keyword and the other has gone out of the top100. I was also ranking for 2 or 3 other decent keywords which have slipped down past page 5. Nothing I seem to do is bringing this keywords back. I did noticed though a lot of links have been deindexed that was linked to my site as they number has gone down dramatically in webmaster tools and also on alexa so could it just be the fact less links are pointing to my site and I just need to build them back up again? Like I say though I have built up quite a number of links since then and also purchased 1 or so services from here to help which have done nothing. What I have noticed though is although my traffic has reduced to just under 50% of what it was before, I am getting more traffic from longtail keywords. More than I was before.