I've seen a few posts (1,2,3) from people recently who are announcing new software uploaded to unstable.

It's my understanding that, even in freeze time, unstable is designed to be for packages which are supposed to be going into the next release. Therefore packages which are intended for the release after that (lenny+1) should not be uploaded to unstable until Lenny is out. Perhaps experimental is more appropriate (that's where I've put a few of my such packages).

Please correct me if I'm wrong.