Yesterday, Microsoft launched Visual Studio 2010 (in particularly nice boxes!). I just finished installing it on all my machines - I recommend you do too:-) Amongst many features, you get a nice improvement to C#: dynamic types (as detailed in our forthcoming ECOOP 2010 paper). You also get a whole new language: Visual F#. Congratulations to Don Syme for probably the biggest tech transfer out of our research lab.
(Unlike other companies, Microsoft clearly loves multiple programming languages!)