Parallelism in D?

[Ansible]

Parallel programming being the Next Big Thing these days, I'm wondering 
what is out there as far as parallel programming 
libraries/utilities/whatever for D?

Has anyone created a D layer for MPI, for instance?  What about 
transactional memory?

I have a game engine that I wrote in C++ and I'm thinking about porting 
to D one of these days.  Making use of those extra cores is high on the 
priority list for me in the future.