Howto: Reboot and Reset your Android G1 Phone

Now all you have to do is pop open that pretty QWERTY keyboard and there are several keyboard shortcuts you can use to accomplish what you want to do:

Home+Back reboot system now - (Soft Reboot)

Alt+L - Toggle log text display - (Toggles between the exclamation and menu options)

Alt+S - apply sdcard:update.zip - (Not brave enough yet)

Alt+W - Wipe data/factory reset - (What I chose, had to re-register, out of the box settings)

Also you can do a factory reset via Settings->SD card & phone storage-> Factory data reset