In the last weeks I started to develop in F#. What I am doing will be revealed in the future, but I want to give some starting points, if you want to try out this functional language.
F# Wikibook: https://en.wikibooks.org/wiki/F_Sharp_Programming
F# for Fun & Profit: http://fsharpforfunandprofit.com/
F# MSDN Reference: http://msdn.microsoft.com/en-us/library/dd233181.aspx