As the developer of Wall Worm for 3ds Max and technical artist for Black Mesa, I'm often asked for tips on using Max for Source. Many Hammer users struggle with the transition. So I started a site for Hammer users to learn 3ds Max and Wall Worm called Hammered to the Max. With it you can learn how to use 3ds Max as your Source/Goldsource level editor (yes, entirely supplanting Hammer).
Here are a couple of the videos included there: Link above includes these and more.