1-Wire fans:
There's more for you at...
http://www.phanderson.com/arduino/ds18b20_1.html
(Accessing 1-Wire chips with Arduino)
and
(Stuff about 1-Wire in general... no Arduino SPECIFIC stuff... but specific Arduino usable info abounds)
Acknowledgements:
The first I have no association with, I just know the source is reliable.
The second is mine.