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If you haven't done any 301 work, it could be your KW density.
From another post:
After August 06 update: After much testing, I lowered KW density...all my pages are back up and ranking well on MSN.
*Here is what I found...use KW no more that 2 times in Description Meta Tags.
*Keep overall page density under 3%.
DON'T over optimize Meta Tags or Page Body...
choose 3 or 4 KW's in your Description and use no more than 2 times...all others 1 time.
Use the same KW's for page body and keep in the 3% range. All other page body KW's keep at 1% to 2%.
Yahoo also seems to like this density...traffic has increased.
Google is not a big traffic generator for us yet, so I can't say.
If Google is your main SE with plenty of traffic, I wouldn't touch a thing, however if MSN and Yahoo are your main SE's...the above worked well for us.
Hope this helps.