This is a situation that has occurred to me when using several different roms, so I'm wondering if my problem has to do with my phone or the fact that I'm rooted.
There are times when I hook up to my WiFi here at home to use it for downloading of large files or if the 3G is just crappy. I have had issues where the phone will go into a constant reboot until I do a battery pull, wait to hit home screen, and then get into settings and turn off the WiFi. I have used SPRecovery and ROM Manager, so not sure that either one of those is causing the issue. Once the WiFi is turned off...the phone will work just fine.
Just curious if anyone has encountered this before? Are there any other details you might need?