Howdy -
Happy Valentine's Day! I wanted to point out an awesome Arduino-based project that was designed with CadSoft EAGLE - the Heart Spark:
http://www.element-14.com/community/blogs/pdp7
It's an Open Source heart rate monitor created by Sensebridge, a group of smart hackerspace folks from Noisebridge in SF and hacklab.to in Toronto.
I ordered one last month, and it's fantastic.
Cheers,
Drew