I think one big difference is that if right now I play the GL demo on Firefox using asm.js, it works. If I play the same demo on Chrome.. it works.

Now if I play nacl stuff on ANYTHING else than chrome is does NOT work.

For me its not about having a nice language, it's about being standardized.

Else, I can just provide C binaries, they're faster than nacl anyway.

This is by far the best argument, but how is the performance of asm.js under browsers other than firefox?

> Now if I play nacl stuff on ANYTHING else than chrome is does NOT work.

That's purely an adoption-by-browser problem.

> Else, I can just provide C binaries, they're faster than nacl anyway.

The whole point of both nacl and asm.js was sandboxing.

> That's purely an adoption-by-browser problem.

... which is a pretty big problem, right? Especially since I don't think FF is likely to pick up NaCL unless/until hell freezes over.

I don't see where the point of asm.js is sandboxing. In fact, that's pretty much beside the point. Sandboxing in NaCL is just a necessity.