Fsharp-msdays09 is a project mainly written in ..., it's free.
Slides and demo code for my MSDays 2009 talk on F#
Slides and demos for my F# talk at MSDays 2009
You need the F# September 2008 CTP to run the demos. Get it from: http://www.microsoft.com/downloads/details.aspx?FamilyID=61ad6924-93ad-48dc-8c67-60f7e7803d3c&displaylang=en