Where to find .NET version usage statistics?

Question

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.

Answer 1

Scott Wiltamuth's Visual Studio blog contains some data for 2005. Obviously won't help with 3.5 data, but may be a start.

I also found this from a forum post dated 2008:

For example, from analyzing website's logs I found that of all visitors who has Vista/XP/2000 only 51% have .NET 2.0 and only 13% have .NET 3.0

There seems to be a real shortage of valuable data like this. I was asked a week ago what percentage of Vista installations were 64-bit and all I could find was this article that basically said the data wasn't available.

Answer 2

You can get the stats here: http://www.statowl.com/microsoft_dotnet.php