Mobile Stream has released USB Modem for Treo. This allows people to use Treo 650 smartphones as a USB GPRS modem for a desktop computer.
It currently supports only Windows XP. Upcoming versions of USB Modem are in active development now, and they will have Treo 600 support, will work with Windows 2000/Me/Linux/Mac OS X, and will have “Treo as Fax-modem” capability.
USB Modem for Treo costs $24.95.
More information on this application is available on the Mobile Stream web site.