HA!!! I forgot Lode Runner had the level editor included. I wonder, was it the first game that did that? It's been a few years, I barely remember how to play. ;-)
I had no idea about the creator.

Tags for this video have been changed from 'Portal 2, Cave Johnson' to 'Portal 2, Cave Johnson, DLC, Level Editor, Valve' - edited by Hybrid

1. Dead Space - This game didn't get it's due. Excellent production and easily the scariest game I've ever played. This is a game to be played at night with the lights off.

2. Fallout 3 - See my screenname. Beautiful environments, plenty to explore and Bethesda actually figured out how to make combat fun.

3. GTA4 - All around great game. Not sure why so many bashed it. Sure, your cousin calls too much, but the game only requires you to take a couple of the man-date missions.

4. Braid - A mini masterpiece with a bunch of fresh and sophisticated ideas. We need more games like this.

5. Little Big Planet - The game that keeps on giving. The level editor is massive, powerfull and intimidating. If I ever finish a level, I'll post the details here.

Honorable Mention:
No More Heroes - Avant garde games are rare. This is a good one.
Professor Layton and the Mysterious Village - Cool story/animation and fun logic puzzles.
Gears of War 2 - Great game with much variety. They pulled out all the stops.
Left 4 Dead - Great multiplayer fun, but a bit skimpy on levels.

Not to mention the high profile games that I haven't played yet (Mirror's Edge, World of Goo, Far Cry 2, BanjoKazooee, Prince of Persia, MGS4, Spore).

Yes, the God Rays are becoming one the new defining features for "nextgen" graphics. DX10 in World In Conflict does the thing, and there may be other examples that I can't think of right now. This video uses screens that are pumped up artificially with extra lighting so the game, in reality, doesn't look this great. And keep in mind these are done in the level editor, so there is a discrepancy between this and the real game. Other than that, Crysis can make some stunning scenes in-game, but either way neither will look that good on a youtube video.

It does look astounding but gameplay-wise it could get old. You're relying on the level-editor to spice it up. The pricing will be interesting on this one.