you can do a bit more with 1-wire stuff. temperature guages, pressure plates, on/off switches. depends on how deep you want to get.

dallas semiconductor has oodles of 1-wire stuff. try googling '1wire switch'

here's a cool little 1wire project:
http://www.rentron.com/PicBasic/one-wire2.htm

from the page:
The switch status displays will alternate from ON - OFF, and the LEDs' will blink for visual status indication of each switch output. The temperatures will change when you touch individual DS18B20's. This project would be easy to modify, and have the switches close or open based on temperature readings for zoned damper controls, and more.