I’ve been interested in and looking for an ideal multi-function device for years now, partly because it’ll enable me to work anywhere anytime, without getting bogged down with big & heavy equipment.
The Treo 650 looks most interesting now, especially after a series of hacks which increased its capabilities significantly.
However – at this form-factor, I’ve found they’re still not powerful enough, because Li-ion (at that size) simply still doesn’t have enough capacity to power a more powerful processor, for an acceptable length of time.
Various wireless features (bluetooth, WiFi, GSM, etc) also suck on batteries like babies on milk bottle.
So after years of waiting, I must concede defeat, and will forget my dream for now – until a much better battery technology become mainstream.