On my web site at raspberrywebserver.com, I've written tutorials about web programming and programming with databases in Python. I want to build on the ideas in these tutorials to do something a little more complicated. To that end, I built a Raspberry Pi temperature logging system.
It consists of two scripts. One is triggered by cron which reads the temperature from a DS18B20 sensor, and logs it in an SQLite database. The other script is a web UI that displays records from the database using Google charts. You can see a screen shot here: