Quite interesting poster was published on Brad Abrams MSDN blog. It is a quick overview of Sliverlight 2 goodies for developers. Along all those ‘new’ tags nice thing is that Firefox and Safari is in the Browser/Browser integration list, mp3/png is in the Media Pipeline list and finally IronRuby and IronPython are in Framework Language [...]

Check this. Looks very promising. I will check this out in some spare time :)