Microsoft Download Center is now offering a fresh Community Technology Preview of F#, which is available for free of download.
"The F# April 2010 CTP provides all the tools and resources needed to develop applications with the F# programming language. It's available as an MSI for use with .NET and Visual Studio, and as a ZIP for use with other CLI implementations and platforms, including .NET Compact Framework on Xbox 360, and Mono on Mac, Linux and other platforms," Microsoft noted
"F# is a functional programming language for the .NET Framework. It combines the succinct, expressive and compositional style of functional programming with the runtime, libraries, interoperability, and object model of .NET.
F# is well suited to a spectrum of development tasks - from interactive, explorative scripting to component and large-scale software development. The CTP release of F# provides further support for explorative development using F#, as well as improved Visual Studio integration to enable large-scale, tool-based software development."
Download: F# April 2011 CTP