From Matt Cutts, on Threadwatch:

“What Lane seems to be saying above is that Business.com reserves nofollow for links that haven’t been through editorial review. “

So, does that mean that any link that has gone through editorial review does not require a no-follow tag, regardless whether it is “paid” link or not? That has always been my view, but it was unclear if Google felt the same way.

It’s a good thread – well worth following as positions appear to be shifting.