According to this site
here, the local ABC/NBC/CBS/FOX channels are already uplinked and it is only a matter of time before they 'go live'.
From what I can tell, it is supposed to happen late April or early May 2008. The only channel I can receive OTA without use of a massive UHF Yagi antenna is
WZZM 13, which broadcasts not too far away from here. Unfortunately if I use signal boosters to amp the other channels, TV 13 becomes too overpowered for my TV. Honestly, I haven't spent much time on the problem overall.
Ideally, for the best picture quality, I'd love to be able to pull all the stations in OTA but it just isn't going to happen where we live. Maybe when everything switches over to UHF in early 2009, we will receive better OTA signals.