Are you a Windows guy? You most probably won't like playing around with Nokia 770, which runs on the Debian GNU/Linux initiative, BusyBox.
Due to the phone's open operating system, a lot of hacks can be made into this phone, some of which will be discessed here at LinuxDevCenter.com. The said website also introduces the phone to those who are largely unfamiliar with its capabilities.
Link: Linux on the Nokia 770 Internet Tablet | O'Reilly Media