From the comments:
I think this is breaking away from Stackoverflow.com and might not be a good idea, unit testing is programming and Stackoverflow is for programming so I think it belongs there.
I think unit testing is an interesting enough topic to warrant its own community. Not enough people are doing it, and there are clear leaders that could contribute answers. I don't usually find StackOverflow itself useful when I'm seeking unit testing advice.
This sounded like an important debate, so I though I'd take it to meta. Any thoughts?
EDIT: the proposal is getting close to going into private beta, so we need some sort of verdict. I think any testing questions would be answered well on Stackoverflow and that this fragmentation will not serve the community well.