Four days ago my twitter has been nuked. The bomb has exploded after TypeScript site link has reach to top of Hacker News and people watched the video of Anders Hejlsberg who generally described the language features and showed some example. Everybody were talking about TypeScript.
I've been using static type languages for about 10 years. I've very much got used to compiler error messages and truly believed that it helps to build applications. Meaning, the complier is first guard towards the 'good' code. To the code that could be called reliable, error free.
And it's absolutely not about Static vs. Dynamic languages.
Static types are not useless, though. I think, in average it reduces the chances of bug introduction into the code. That's at least what I've seen so far. And that's why "purists" are running JSLint. Basically, Static Types should provide better application quality. This is of cause not completely true, since we know great software written in Python and poor systems written in C++.
It' about the engineers who build that software.
TypeScript is interesting project and open minded guys will like one.