I've bought a 4-way temperature sensor for my new apartment, and decided that I needed to update my existing thrown-together rrdtool scripts. So I did. :)
You can get the result from http://foodfight.org/download/graph-spul, using either a plain HTTP or using bzr. It loads plugins dynamically based on the config file, and it includes 3 plugins by default (one for the temperature sensor, one for ethernet statistics, and one for reading temperatures from a hddtemp daemon).
Example output (yes I know I haven't wired up the other 3 sensors yet ;)):
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