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@Gordon most sensors measure temperature and humidity (the accuracy of the humidity sensor is however debatable)
@MetallixBrother Yes range is a problem... if you still have to apply additional nodes as repeaters the advantage of using prebuilt temperature and humidity transmiters is little.
Sidenote:
I tried two different receivers in for my project, the cheap MX-05V
http://www.ebay.com/itm/433Mhz-RF-transmitter-and-receiver-kit-for-Arduino-ARM-MCU-WL-/261041100836?pt=LH_DefaultDomain_0&hash=item3cc7431824and the little more expensive RXB6 once.
http://www.ebay.com/itm/271638472090?_trksid=p2060778.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AITThe 2nd type had way better reception quality in my tests.
AntiCat
@AntiCat that's a good thought actually. If you just want temperature (and nothing else) then those might be interesting (and cheaper).
I've also done some JavaScript for a 433Mhz reciever website that uses line in of a normal PC (or an Android device), although if you have a Pi it'd be easier to plug it in direct.
You can actually install Espruino itself on the Pi and use that to receive Radio signals in the same way. It's not fast enough to decode many different types of device, but I have tried decoding a single 433Mhz protocol that way and it works great.