Today GoogleGuy posted a message on a lengthy Webmaster World thread about the Bourbon update.

"Here's the advice that I'd give now: take a break from checking ranks for several more days. Bourbon includes something like 3.5 improvements in search quality, and I believe that only a couple are out so far. The 0.5 will go out in a day or so, and the last major change should roll out over the next week or so..."

This will no doubt be some comfort to webmasters who have been hit hard by this update - hopefully more changes are to come.