The tutorial pages show examples on using wedges to tighten side joints, but how do you tighten end joints for glue downs?

A very soft rubber mallet. You would have to watch me to get the idea. Smack the face of the board with a tweak of the wrist, toward the direction you want the board to move. You can use it to tighten side joints, too. Just don't get carried away with it.

Thanks floorguy.
Have you thought about making a instructional video/dvd for installing hardwood?