Every year since 2003 (perhaps earlier) Google has gone through a massive changeout process. You can call it an update, an algorithmic change, a recrawl/rebuild process, etc.These Google upheavals usually start in October and their full effects are usually noted by mid- to late-November.If your Google listings have radically altered over the past week or two (or by the end of November 2008) and you require an opinion in it,post the following site details in the forum : highrankings.com/forum/index.php?showtopic=38143:

Age of your site (in years and months)
Size of your site (in page ranges: 1-10, 10-50, 50-100, 100-1000, 1000-10000, 10000-100000, ...)
How many pages you think Google should normally index
How many pages you think Google is currently indexing
Have your rankings changed on Ask, Live, or Yahoo!?
Do you use Google Analytics or some other package?
What approximate percentage change are you seeing in search referrals from Google?
Have your search referrals from other services changed?