The 650 really picks up where the 600 left off, and while it doesn't look too different to the eye, many of the changes are under the hood or subtle manipulations of the 600's design. It runs the new Palm OS 5.4 and has a much faster 312MHz Intel PXA270 processor, but the most immediate difference is the screen: it's now double the resolution at 320 x 320.

The new Sony Ericsson P910i is the only true phone/PDA hybrid on review in this roundup so aesthetically it marries some of the largeness of a PDA with the slimness of a phone to end up with a unit that's just right: it's not too big and not too small.

The XDA (January 2003, page 41) and the XDA II have both done well in PC Authority reviews before, but our main complaint has been one of size: the XDA's are normal PDAs, but big phones. The XDA IIs still keeps a large touchscreen, but the unit is slightly slimmer and thinner than the previous models.

The new Nokia Communicator  unfortunately evokes early '90s mobile phones: it has a long body, small display and is not something you could slip into a pocket. Closed, the 9500 is monstrous, but when you open its sideways clamshell design the 9500 comes into its own.

The key differentiator with the PDA2k over other PDAs is the whopping 128MB of RAM in-built for media and files. On top of this there's a separate 64MB ROM for the OS and an SD/MMC slot for further expansion.