Adafruit's Trinket
Or for $10, you could get the TI MSP430 LaunchPad [1]. You can then pop off the DIP chip and mount it however you want. It is nice since the chips themselves are about $1 or so each (depending on which one you get).<p>[1] <a href="http://www.ti.com/ww/en/launchpad/msp430_head.html" rel="nofollow">http://www.ti.com/ww/en/launchpad/msp430_head.html</a>