user-defined-literals

User-defined literals (Extended literals) of C++0x... what compiler does support it?

In other thread I introduced some techniques we would use for Model-Driven-Development in C++ once the C++0x, in particular user-defined literals, is available. I just revised the plans for GCC 4.5 and even 4.6 and it shows that this particular feature is not supported. Anyway, do you know if I even have any compiler to test that featur...