called Jibs for Cribs (don't know why..) http://www.jibsforcribs.com/index.html
though, it seems pretty stupid to pay an outrageous amount of money ($1 000) for a box or rail when you can make a pvc one for under 10 bucks.
anyways, i thought that was pretty neat.
apologies if this is a repost.
build a jib cult for those who don't know: http://www.newschoolers.com/ns/cult/forum/cat_id/1453/