Reports via WebmasterWorld that Microsoft released a new update for its MSN Search, Windows Live Search product over Thanksgiving weekend. Senior member, crobb305, was the first to report it, stating;
In the top 20, on a financial term I watch, I only see 4 blogspots, versus 8+ a few days ago.
In short, it looks like, to many, that Microsoft pulled many of the splog (spam blogs) from the search results.
Forum discussion at WebmasterWorld.