Justin Gehtland seems to think that NAnt is dead, because no new releases have been done since June last year. He's right about us not having done any new releases, but not because the project is dead, at all! NAnt has matured quite a bit, and certainly a release is overdue... but work and fixes on NAnt continues.
Granted, perhars it is not being developed at the speed at which it began originally, but that's not necessarily bad. Since the last big refactoring, NAnt's core has been fairly stable, which is good. Anyway, Justin, if you don't believe me, feel free to get around our mail list and take a look for yourself :)