It's just a result of the recent backlink update. It's always up and down. Google never lists all of the backlinks for whatever reason. Most of them I guess are "not important enough" to be listed by Google. The other SE's always list a lot more and seem to update a lot more frequently. You can take a look here (All the Web, AltaVista, Google, HotBot, MSN, Yahoo!):
http://www.searchbliss.com/seo-tools/popularity.asp
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