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There are some technologies like LINQ and WPF which are nice, but installation of .NET 3.5 is still slow procedure. It's important to understand - among Windows users how many of them have .NET 3.5 installed?
Is there any good up to date stats gathered about .NET Version availability/usage? I've searched a lot, but can't find.
Update: .NET version IS present in web-agent strings for FF and IE at least. So there SHOULD be somebody who have that information. Anyone with access to really large web-site logs?
Update 2: I also understand Vista means that user have 3.5, but XP is still dominating the market.