For libraries F# is probably superior to all, as it has libraries for virtually everything, and can interoperate seamlessly with COM and .NET. I doubt there will be any library functionality that can't be found or bought.
Libraries for monad transformers
I found lots of stuff for Monads: http://blogs.msdn.com/wesdyer/archive/2008/01/11/the-marvels-of-monads.a spx http://blogs.msdn.com/lukeh/archive/2007/08/19/monadic-parser-combinator s-using-c-3-0.aspx No Monad transformers yet, but I have seen GADT's in C# (which means they probably work in F# too).
or comonadic streams? ;)
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