Use sentence case. USING ALL CAPITAL LETTERS LOOKS AS IF YOU'RE SHOUTING.
Use the blind copy and courtesy copy appropriately. Don't use BCC to keep others from seeing who you copied;
Don't use e-mail as an excuse to avoid personal contact. Don't forget the value of face-to-face or even voice-to-voice communication. Remember that e-mail isn't private.
All you need a Windows Mobile device, Pocket Nester plus and a few cab files to go back down memory lane and start playing Mario Bros on your WM phone ;)