1. WipEout HD & Fury
2. Ratchet & Clank Future: Quest for Booty
3. Flower
4. Savage Moon
5. ---
Come to think of it, I haven't downloaded many PSN games... I've got Linger in Shadows, but that's just weird. I can't think of any others I've got right off hand. There's a ton out there that I'd love to get, but they'll have to wait for when I have access to my PS3 again.
And yes, WipEout HD is better than Q4B. Before, it was really close, but with the Fury expansion, WipEout HD is by far the game I spend the most time with and get the most enjoyment out of... This is the only game I really want 100% trophies in, but it's just so hard! Well, it'll keep me busy for a long time at least.
EDIT: If we're counting PSOne classics, add Spyro/Crash to the list. I can't choose between them. 
