Those that have yet to wrap their head around the notion of open source hardware may want to mosey on over to the MAKE blog, which has put together a quick primer that attempts to clear things up for you and set you off on the right foot. Among other things, it sorts out the partially open source hardware like Linksys's WRT54GL router
from the truly open source gear like MAKE's own Daisy MP3 player
(pictured above), and provides a few suggestions to ensure that your own open source hardware creations remain as such. True to its nature, the primer is also admittedly a work in progress, so you know what to do if you see room for improvement.