Earlier today, I briefly noted that Google is dropping pages and then bringing those pages back into the Google index. The question is what is going on. Honestly, I have no idea. But at least, let me give you a ton of forum threads that may have some clues as to this weird Google behavior.
WebmasterWorld Forum Threads:
- Very Odd - Big Drops in SERPS Today April 26, 06
- Major Change in Supplemental Result Handling
- Somethings Up Right Now! -- 30 domains just went "home page only"
- Pages Dropping Out of Big Daddy Index
There are also other threads, but those are the most active and recent on the topic at WebmasterWorld.
DigitalPoint Forums:
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rustybrick in Google Optimization at May 4, 2006 8:02 AM
Comments (1)

Comments
We have had a good thread at WPW going on this since March 10th.
http://www.webproworld.com/viewtopic.php?t=61582&highlight=
Posted by Jaan Kanellis at May 6, 2006 00:27