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The Plam add-on that everyone has and that can be had for
a song is the Palm III Modem.  I picked mine up for less
than $10 somewhere in the original box shrinkwrapped.
Apparently they mad millions of these!

This lets you connect your Palm to a phone line and sync
to your computer from everywhere.  There was once a Palm
server software package, but that is gone.  With this and 
a standard ISP dialup account, you can have email and web
browser (my favs come from the eudora people) on the road
without dragging along a laptop.  Cool!
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