I picked up the Psion Travel Modem, which is a InfraRed (IR) Modem that plugs into a land line. In no time at all, I was able to get a conenction set up and connect to the internet at 51,6000 bps using it.

This is a good alternative if you want to use your Treo as your e-mail station, and can be near a land line, but don't want to use wireless access for either cost or speed reasons.

Since one of the complaints about Treo is the lack of expansion, I thought you guys would like this one. You can find this unit on ebay sometimes and yahoo shopping finds a couple of stores with it.