If you are building an application for general release, and would like to build it using .Net 3.5 SP1, it would be nice to know if the end users already have .Net 3.5 SP1.

We can safely say that the majority of end users has .Net 2.0, as this is part of the Windows update process.

Currently to upgrade to .Net 3.5 SP1 you will need a separate download,which is not a small download.

Help is at hand as Microsoft will be shipping the .Net 3.5 SP1 through Windows Update, for all users that have .Net2.0 installed, and Windows update enabled, this will be available in January 2009.

This does not apply to Visual Studio 2008, as you will still require a separate download.

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