Just when you thought it was safe to go back in the water, Microsoft drops yet another developer preview — this time a preview version of the F# 3.0 programming language. The Visual Studio F# Team Blog offers plenty of detail on the new preview release
F# 3.0 Developer Preview is available for immediate download for MSDN subscribers. The release will be made available to the public on Friday at 10am Pacific Time. The F# compiler will continue to be available as an independent installation, but that configuration is not part of this preview release.