Re: SIM Card slot???
you don't run the entire linux operating system from the sim card, you run a small authentication key generator on the microcontroller contained within the SIM card, that generates a rotating key, and lets say stores 10 of them on its internal EEPROM.
Personally i think it's a GREAT idea! Do what the mobile phone companies have done - a combination of IMEI (Chumby Equivalent: MAC Address) and the SIM Authentication Key (Use in chumby) It seems to work for them! And what's to stop you from allowing a certain number of IMEI/SIM combinations in a single Premium Chumby account?
every chumby is squishy, except the ones that arent.