Sorry to bump an old thread but theres this article
http://www.driverheaven.net/articles/Valve_Editor's_Day_1106
that show an extra two videos i haven't seen in other articles
The good :)
1. Half-Life series
2. Command & Conquer series
3. Age of Empires 2
4. Anachronox
5. Psychonauts
6. LEGO Star Wars
7. Grim Fandango
8. Monkey Island series
9. Max Payne series
10. Super Mario RPG
11. Beyond Good and Evil
12. Jak & Daxter series
13. Red Faction
The...