Arduino Pro Mini 328 - 3.3V/8MHz
This is a 3.3V Arduino running the 8MHz bootloader. Arduino Pro Mini does not come with connectors populated so that you can solder in any connector or wire with any orientation you need. This board connects directly to the FTDI Basic Breakout board and supports auto-reset.
The low-cost and small board makes this Arduino ideal for embedded applications.
More information is available on the website of Sparkfun.