Robert Pickering (the author of Foundations of F#) has just posted on a blog entry on the Game of Life in Silverlight and F#. Very nice work Robert! You can run it here.
What amazes me about this is that it "all just works". Here we have a functional language, with a fully fledged client-side execution and graphics engine, and the F# team haven't done anything Silverlight-specific for this to work. ,NET really is incredible.