Ruby developers everywhere will be flocking to Snow Leopard like nats on a lamp post... with all of our open source software compiled and running against 32-bit libs... take this guy's recommendations before you go clicking "Upgrade". Otherwise, I'm sure you Fink and MacPorts users will find these tips more appealing.

cheapRoc, aka Justin Reagor, writes about Git[hub] Pull Workflows in Open Source. For the kids he's included a nifty lil comparison to Git/Push/Pull through describing HTTP/Comet/Ajax.