Shaddows - 6:02 pm on Mar 14, 2012 (gmt 0)
A similar under current running through lots of threads these days: how challenging it is to monitor changes and then think about ways to tweak your site for ranking gains (or recovery).
IncrediBill made a point over in AdSense; daily fluctuations happen. Worrying about it is just wasted energy (and posting it even more so).
It's trends that matter, both in terms of your own site, and what is coming and going in the key SERPs you monitor.
Everything else is noise.