Data Logger
Even though I believe that everybody should build their own data logger, there are a couple of small and inexpensive products out there that make data logging very simple.
AVR Stick
This great little data logging device can be bought from SparkFun for less than $10. It has a ATtiny85 and a USB port.
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uLog - The Lil'est Logger
This great little data logging device can be bought from SparkFun for less than $20. It has a ATtiny24 and an 16Mbit flash IC.