Brendan Eich, CTO at the Mozilla Foundation, posted in his blog about three new projects that were announced. The one I care about the most is IronMonkey, which is to make Mozilla's Tamarin VM run IronPython and IronRuby (and thus I would assume .NET code that can run under Silverlight).
At least I don't have to feel bad about not getting to try to get Python into Firefox now. =)