Couple of things I noticed:
Shanghai Dynasty (DC) unreleased English version
Illbleed (DC) debug
Jet Grind Radio (DC) debug
The Vatz (Xbox) unreleased demo - anything about this game is quite rare
Dinosaur Hunting (Xbox) unreleased English version
Made Man (Xbox)
Hail to the Chimp (Xbox)
I don't download every single proto that appears but I do collect quite a few titles.
Edit:
Ok more than a couple
