These little things are so useful and energy efficient that we buy them in packs of 5 to save on shipping.
We use them so often that it makes sense to, especially at around $25 dollars.
As a side note, these work really well with these Lipo Batteries.
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This tiny little board does all of the neat-o Arduino tricks that youÃ¢â‚¬â„¢re familiar with: 4 channels of 10-bit ADC, 5 PWM pins, 12 DIOs as well as hardware serial connections Rx and Tx. Running at 8MHz and 3.3V, this board will remind you a lot of your other favorite Arduino-compatible boards but this little guy can go just about anywhere.
This is the 3.3V version so, as always, keep in mind the limits of system voltage and so forth. The lower system voltage also has its advantages, though, like ease of use with many common 3.3V sensors. There is a voltage regulator on board so it can accept voltage up to 12VDC. If youÃ¢â‚¬â„¢re supplying unregulated power to the board, be sure to connect to the Ã¢â‚¬Å“RAWÃ¢â‚¬Â pin on not VCC.
Sparkfun's smallest Arduino Compatible Board yet!