One again, have you tried Cilk for exactly this kind of thing? I'd
be curious to know your opinion on how what you see in SL compares to
it.

> Blocks themselves are really not terribly useful, you need the
> libdispatch library to make the real value in them come out, which
> does all the queue management by talking to the subsystem of Snow
> Leopard called "Grand Central Dispatch".

Could you, please, send me a pointer to the API docs? Off list, perhaps?

Thanks,
Roman.