I dunno, that's a real good question.
Me personally, I think we should just go the '...and then they told two friends...' route. I don't know if it's cool promoting a board on someone else's board.
I will ask Matt Russell if it's cool to put up an announcement on R3v;
if someone knows the guy who runs E30tech, maybe do some outreach to him to make sure it's cool...
If we keep everything mostly informative word will spread pretty quick.
Other ideas on this are welcome...