I've had a treo 650 for almost a year now, but I've never really delved into the more intricate features. Originally I had a "data plan" for it but realized i used it maybe one day a month so it wasn't worth verizon's $50 monthly charge and discontinued it. With my treo (which i love because of the form and clean OS) the main features i really use are the SMS chat (not really a feature) and the alarm. I'm by no means excercising the full power of the device. I'm sure I'm missing out on lots of cool tricks, so i was wondering, for those of you with treos, what's your "favorite" feature?