I've been trying out the latest IPAQ - the brilliant M5550 with built in Wireless and Bluetooth. One of the best features of this version is it has a removable battery, as well as a back up battery built in. Top marks for simplicity, although one wonders why that wasn't incorporated into earlier versions.

My old IPAQ 3850 came without bluetooth or wireless, and was much heavier. This device can be carried easily in a jacket pocket, without one leaning 25 degrees to the right!