Visual Studio Orcas Jan CTP
This one COMPLETELY flew under my radar. Check out the details here. There are all sorts of goodies in this release. I think the first thing I am going to try out is the JavaScript Intellisense. I'm unpacking the compressed download right now:).
UPDATE: I jumped the gun:(. The release notes have a typo in them. JavaScript Intellisense is NOT in the Jan CTP.
-Marc