I was surprised to find a plethora of goalkeeper training videos on YouTube. I'm putting these so I can find them again to use with my goalkeepers.
34 goalkeeper drills.
This one is quite thorough but you have to watch and replay to catch everything.
More pre-match warm-ups
Make yourself big in the goal and proper drop-kick technique.
Goal technique from Real Salt Lake goalie
How to practice on your own
And one more, in German with some good drills and conditioning