Gmorgan - 5:59 pm on Jan 23, 2013 (gmt 0)
Seeing some big changes here. Of 100+ SEO clients, about a third have been affected. Some have jumped up pages but a handful have slipped.
The common theme is that the page Google is displaying for a result has changed. In some instances, the result now being shown as a result is actually the 3rd, 4th or even 5th most relevant according to their own site query (i.e. "putting this into Google..."example keyword" site:www.example.com)