New Unity GUI tutorials

I’ve been making a GUI out of OnGUI calls for about a week now, and it’s starting to get really laggy. I looked around and found that Unity had released a new GUI system in 4.x. I’m using 4.3 and I really want to start using this new GUI. Does anyone have any links to some good or official tutorials to start using the new GUI system? Thanks :).

Check this link out :