Considering the resolution of today's monitors, and the fact that people would rather watch stuff on larger-than-iPod screens whenever possible, the resolution of downloads must be at least 1024. Even at that, almost no one will be watching at full screen. When it gets to that, I'm in (should it be available in Canada).
My list (not in order of importance):
-Movies from the advent of talkies on with particular emphasis on B-Westerns, Tarzan, Sherlock Holmes, Film Noir, Sci-Fi, Adventure, Horror, serials, etc.
-Wyatt Earp starring Hugh O'Brien
-X-Files
-All Star Trek (well, except for maybe DS9)
-The Lone Ranger
-Superman starring George Reeves
-I Love Lucy
-Babylon 5
-Rawhide
-Cheyenne starring Clint Walker
-Into the West (Speilberg)
-Have Gun Will Travel
-Deadwood
-Ma and Pa Kettle
-Martin and Lewis
Coming Soon to An iPod Near You