gprs/microcontroller interface links

Can anyone point me to links about interfacing microcontrollers to gprs units?

Has anyone used the round solutions gprs module with embedded tcp/ip stack? It is relatively cheap (~$200) and interfaces via AT commands via a serial port. Amazingly I have found zero posts on dejanews about anyone using one of these on their robot.

Well? What are you guys using?

Thanks,

Rick

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