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bobc
That's an interesting project!
You can get little RF modules which might be useful. The comms protocol could be quite simple, you just need to set and read temperature. I think you could use a small board like a sanguinololu to build a prototype, although you wouldn't need all the features on there.
That is a nice and quite simple but powerful solution!
I have never done any wireless communication, so this might be a stupid question, but how would you connect the RF-Module to the MC? Would you take the I2C port or would you use just the plain digital pins?