If there is one good thing about the Dev Team, it’s that they work fast. Following a few issues with YellowSn0w, they have already updated it to version 0.9.4 and it supposedly fixes a bunch of issues. It is still in beta but it’s much more stable than it was. So if you had issues unlocking your iPhone 3G using YellowSn0w, try again with the latest version.
It’s still available in Cydia and you can still read this for the full iPhone 3G unclok tutorial.