Seems the forum search deamon is not working right now (or maybe I'm such a new user it isn't enabled for me yet but that seems a little ridiculous)
Reading up more on the DS18B20 it looks like it needs to be queried to report a temp, which is great for power saving when connected locally... but if I as a total n00b understand this then I would need a transmitter and receiver on each end to close the loop.
So I'll go do some more googling but if I understand this at all if it is at all possible to only use one Arduino I'll need a digital temp sensor that skips that greenie power saving stuff and reports a temp on power up, or every few seconds or something. Am I way out in left field with this thinking? If I can keep the remote transmitters to only run on smallish battery and last a while that would be nice.