I got a fun alternative for you ;) Best weekend project!
[Link: code.google.com]


If you got some basic Simpl+ knowledge you can easily modify this.

One breadboard-module can have up to five sensors if im not mistaken. The breadboard is connected to one RS232.

I made two breadboard-modules with the total of 6 sensors for 15$ thanks to ebay ;)

edit: Here are some information regarding the temp sensor: [Link: datasheets.maximintegrated.com]