Our language service APIs are all open source, so feel free to hack together support for your favorite IDE and let us know! (Check out the code under src\services, and let us know if you have questions.)

I can't imagine it'll be too tough for other IDEs to support.

There's a pretty impressive demo here: http://www.typescriptlang.org/Playground/

It even has auto-complete if you press "Ctr-Space" while typing a word. Considering the source for all this stuff is freely available, I don't think it'll be too long before other IDEs support it.

The language support in VS is really great, and getting better with each release. Go to definition, code outlining, folding, type information on hover, intellisense; all these make writing code much less easier and error prone, especially if you are used to writing in a language like C# or Java in a good IDE.

But does VS run on Mac OS X or Linux? Didn't think so.

Ah right, misread your post. I was just commenting in general on the VS support, you are right that it would not be as nice on other platforms.