I got a hand-me-down Pocket PC Phone from Kartik. (Thanks Kartik!).
It's the HTC Wallaby (aka O2 XDA, or T-Mobile MDA, etc.). HTC doesn't advertise itself much, but they make just about every Pocket PC-based phone out there.
This device has replaced my old Sony-Ericsson T68i. It's quite a bit bigger, but it adds so much that I don't mind.
The web browser is a big help for taking the bus, in two ways:
I wish for a slightly larger display, and higher resolution. Some devices have VGA resolution, which would be very nice.
I wish the GPRS connectivity was slightly more reliable.
The IM is a bit dodgy because the GPRS link comes and goes. But when it's working, I really wish for a keyboard.
The good news is that I rarely take my laptop anywhere, even to meetings.