Options for cellular plans - SIM Data Only

[bpair]

Is anybody connecting to the internet via a SIM card? If so what cellular plan are you using? I think I can stay below 1GB a month and I am in the United States (North Carolina). I know there are a few companies offering M2M Data Only plans but I have not been able to organize what is currently available. I also know Twilio is joining with T-Mobile but I have not seen the plan yet. Does anybody have any information?

[bpair]

This site has the best collection I have found: http://www.embeddedworks.net/wsim3951.html

In the US the T-Mobile pre-paid seems to be the best deal. Similar on sparkfun
https://www.sparkfun.com/products/13186