I upgraded my iPhone from version 1 to 2.0 5A347 following the clear instructions at Lifehacker
The upgrade was seamless. The upgrade was totally worth it. I see the GUI much more responsive, Wi-Fi access/connectivity is much more faster. Battery doesn’t seem to be draining quickly with Wi-Fi turned On.
First thing I installed from the Cydia repositories is OpenSSH. A screen grab ( press Home button + Power button in the iPhone and a screen capture of the current screen gets saved in Camera Roll. Sweet !) of the Terminal shows the coolness the iPhone brings along,
eth1 is a machine in the Office network running Ubuntu Hardy 8.04. The best part about this is I can play a prank and reboot the machines in office and have everyone stumped. Muhhaaa 