Awesome show. Four seasons so far. Wikipedia presently has a good history of the origin of the show:
http://en.wikipedia.org/wiki/Yo_Gabba_Gabba!
Also, a nice summary of Lance Robertson's story:
http://en.wikipedia.org/wiki/DJ_Lance_Rock
The best origin story article that I've found so far, sort of ties everything I've seen in other sources all together:
http://www.ew.com/ew/article/0,,20348539,00.html#
Info about the live show, or it would be if it wasn't so polluted with flash and other crap that I can't even read the site:
http://www.yogabbagabbalive.com/
The fan site "gabbafriends" is utterly cool, just a huge list of peoples' personal stories going to the live shows or having YGG themed birthday parties:
http://www.gabbafriends.com/
