From the geniuses at OmniGroup:

We could have said “Yay, Siri and OmniFocus can work together” and gone back to our long-term projects. Instead, a couple engineers got to talking “You know, if we… and then the server… and…” “Wow, I think that would totally work!”

So damned sweet.

UPDATED: I just had a chance to play with this and it really does work well. Much better than other solutions I have seen. Additionally it “completes” the task that you added to the Reminders app so that you don’t get a double notification. If you work at the OmniGroup and see me on the streets of Seattle I will happily buy you a drink.