DSS Circuits - bringing SMD to DIY
This is a cool site with some interesting PCB's including an I2C GPS Arduino sheild. The owner of the site, Wayne Truchsess has also written a great I2C library that I am using now.
Check out his open source tracking device that featured on Kickstarter here: http://www.kickstarter.com/projects/dsscircuits/open-source-tracking-device
[original story: Let's Make Robots]