We recently had the Zombie Engagement Session, and now we have the Portal 2 Wedding Proposal. Yay for nerds getting married!
This is a long video, so if you're just interested in the actual proposal part, it starts around the 7:00 mark. If you're a Portal fan, though, you'll probably appreciate the game play and the commentary along the way.
The game levels were created by Douglas “TopHATTwaffle” Hoogland and Rachel “Miss Stabby” van der Meer. They even got Ellen McLain to do the voice of GLaDoS. Pretty awesome stuff.
You can read more about the story at technabob.com.