graeme_p - 6:26 am on Jan 26, 2012 (gmt 0)
IS there anything else important going on as well as this change? I have noticed large multi-subject sites gaining on smaller niche sites, and there seem to be a lot of unmaintained sites in the SERPS (that may be just my recent searches).
My usual reaction to losing ranking has been to wait, and its always gone hack to normal in the past. Given all the unknowns is that the best reaction (except for sites that are clearly very ad heavy above the fold).