If you want to see real F# programming showing off the power of function composition, I found some great blog posts earlier tonight. They are actually by Dustin Campbell on his blog: http://diditwith.net/CategoryView,category,Project%2BEuler.aspx.
I think these posts are some of the best F# posts I have seen out there so far. I love them because they show off the real beauty and power of F#, and don't do the whole “here’s how F# can behave like other languages” treatment that I’ve seen in so many other places.
Those posts (and any other F# posts on Dustin’s blog) are a MUST READ if you are at all interested in F# or functional programming.