I am using CM7 right now, and was just using Das BAMF 3.0 RC3 and RC4 without issue if you want to blame GB.... but of course a new ROM is totally up to you... but it would be a good way to check your issue... and you can always revert to a backup fairly quickly.
I am currently having this issue on BAMF RC3, over 18-20 percent dialer consumption after 4 hours of standby. Not sure what could be causing the issue but plan on flashing RC4 tonight. Also upgraded to the newest push of the Radio a few days ago.
I'm on 2.1, and have been for weeks now and don't have this issue. I used rc4 for a bit and it seemed to have a faster battery drain. Imho 2.1 remix is just so much more smoother then rc4. I've had the best battery life and experience on 2.1