Never happened before.
Last night plugged into USB to sync and recharge. Unplugged 2 hrs later. 7 hours later battery was down to nearly dead. Less than 40%

Theory #1-
ActiveSync didn't disconnect properly and drained trying to reconnect.

Theory #2-
This one area of my house is kind of a dead zone. Omnia beat itself up trying to get a strong signal.

Theory #3-
Bluetooth, though there was no bluetooth devices turned on near by.

Wifi was off.
I did a soft reboot when I started recharging it this morning so I don't known what apps were running. Ooops. shoulda investigated.

I hate to theorize, but I just think the whole charging/battery design sux. That is the center of the whole problem. Bluetooth shouldn't be an issue, not sure on the AS connection issue, but I use google sync, and it is using AS sync pretty much constantly, and doesn't drain the battery. If your phone is getting really hot on the bottom back, you have a problem, and should have it replaced. This is an issue VZW is well aware of...