I've always found "The Puck Stopps Here" 1 and 2 to be great instructional tools and would highly recommend them. While they may be a bit dated, they are very good at covering the basics of both the stand up and butterfly styles. I still watch them and find them relevant even now!
This link is for the Jim Park Goaltending School, the school that made the videos. You can locate the videos in the sidebar on the homepage.
Jim Park Goalie School