I too wonder how much work it would be to support OpenMP in gdc. From http://www.drdobbs.com/high-performance-computing/226300277 it seems to be that there is also quite a lot of magic on the compiler side (but which could already be in the gcc parts). Maybe a concurrent garbage collector would also be needed (Leandro Lucarella worked on this for his diploma thesis).
I hope someone can help to clear this up. If not OpenMP then at least a better support for multicore programming in one way or another will be really important for the future of D.
