I'm using the ROM Manager but I have had this issue too when using the nandroid methods. When I install just about ANY ROM other than the Cyanogen ROM I have issues with boot looping. Its very odd. If I am running the Cyanogen ROM I have no issues at all. I get the boot loop immediately after loading the ROM. No applications have been installed yet, and I have not even had the chance to do any restores using Titanium Backup. The latest ROM I attempted was the Steam Dark Edge 1.2. Before that I have tried the Bugless Beast (Prior to 1.0) and with both I have boot loop issues. Also the same with the latest Ultimate Droid and Smoked Glass. So it must be something I'm doing or not doing. If Im in the ROM manager I choose the option to allow the wipe. I have also booted into the Clockwork Recovery and manually wiped 2 times and attempted the update and again, boot loop. When I am doing the ROM install from ROM Manager, the phone is running Cyanogen at the latest version. I don't remember ever installing a custom kernel but with all of the ROMS I have messed with over time I may have however that should be cleared with the wipe correct? Sorry for the long winded thread. I just want to be able to experiment with all of the great ROMS out there.