Warranty woes
You'll become dependent on your PDA, so get a warranty that will give you a loaner if yours needs fixing.

Sync or swim
Back up, back up, back up. There is nothing more devastating than losing all the information you've gathered on a PDA. And the tiny devices can easily be lost.

Check the memory
Make sure your PDA comes with enough memory from the get go for what you'll need to do with it. Applications are notorious memory hogs.