These are the first Superman cartoons I ever saw...of course, as a kindergartner I didn't realize it was Superman's 50th birthday. We watched Superfriends every afternoon, and the Superboy tv show came on saturdays...
I really hope that all of Superman's animated catalog eventually comes out on DVD. However, it took 65 years for the Fleischer cartoons to be restored and get a proper home video release. Maybe we'll have to wait until the Ruby Spears catalog is in public domain and the Unknown Bryan Singer of 4500 A.D. makes a movie.