Soma just posted that SP1 for VS 2008 and .NET 3.5 is available. The full blog post on his site is at http://snurl.com/28i1z .
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Read the complete post at http://feeds.feedburner.com/~r/JasonNGaylord/~3/288800433/vs-2008-and-net-fx-3-5-sp1-beta-available-now.aspx