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"Something to note is that the problem could fix itself.  Out of that 3-5% of the queries impacted, some sites are gonna get hit incidentally.  Google seems to be decent at spotting these over time and fixing it.  Sometimes people get the short end of the stick though." Thats a very good point. We have often notice websites take a hit after an algo date, only to come back a few days or weeks later. One thing is sure- this seems to have affected quite a lot of sites. The site we have seen drop has a very natural link profile and no "over optimisation" in terms of keyword stuffing etc. There seems to be alot of poor websites that have benefited, as mentioned- blank sites now ranking #1 on google! Lets hope we some further tweaks in the near future as currently it seems that there have been a lot of "incidental" hits!