I'm still running 1.5 and I stumbled accross this forum today. I'm reading up on 2.1 and I'm skeptical. Some of my main issues with this phone are its battery life and the USB to the computer (reading). Which seems to be ok when I switch the USB debugging off. Is 2.1worth it?
I would highly recommend upgrading to 2.1. It is really an improvement over 1.5 and helps with battery life. You can get very good directions on doing the upgrade at the SDX-Developers website (SDX-Developers) and can also activate live wallpapers and other options from their customization section. You won't be sorry making the change.
