I'd like to say a word of welcome to James Margetson, who has joined the F# team. James started with us at Microsoft Research in Cambridge a couple of weeks ago, and has a lot of experience with mixed functional/imperative programming from his days at companies such as Abstract Hardware, and has even written ML code for the British Home Office (a government department). He'll be working on developing the F# compiler and tools, focusing mostly on the needs of prospective users inside Microsoft itself. Among many other things he's already implemented some useful optimizations to the IL code generated by F#. Welcome James!
P.S. I've been a bit quiet on the F# blog lately, but I'm glad to say the reason is just that I've finally taken a decent holiday. :-)