I've got a Palm Tungsten E that's a few years old. Like Regina, I use it for my phone/address book, personal calendar (not work stuff), and playing hearts.
I really like having a rechargeable PDA rather than one that has replaceable batteries. With the rechargeable, it shuts down when the battery is low and you don't lose any info. If replaceable batteries die, you have to resynch with your computer to get the info back; if you haven't backed up the PDA to your computer in a while you can lose information.