Thanks folks, for the great ideas! I really appreciate your prompt replies.
I use a miserable AT&T Palm Centro and the horribly buggy and undependable AT&T Xdepressmail to push my yahoo messages, so I didn't know of your info for three days. After gathering the materials for my client and racking the pbx, I have suggested they seek another tech. Yay!
I am looking for a more-suitable PDA and service... but I digress.