Dominic Cooney has just produced a screen cast on Testing F# code with NUnit . There is something in this for everyone: you get to see some .NET details, a taster of F# code, the new F# Interactive toplevel environment, the F# Visual Studio integration, and the synergistic effects of the .NET platform (a testing tool written for an OO language can be reused for a functional language - the same applies to debuggers, profilers and more). Highly recommended!