http://labs.adobe.com/downloads/flashplayer10.html

here are all the new features and the download link

I hope they have finally adressed the issue under linux where the transparancy is not working... although I believe they blame mozilla, its still their responsibility that their plugin works in the major browsers...
Here is a list of new features: http://money.cnn.com/news/newsfeeds/articles/marketwire/0396849.htm

Except for filters and more 3D the feature list at CNN is not that extensive...