This is an excellent thread.

I'd use this at the end of my film, it wouldn't be as the credits are rolling but about 5 minutes before the official end. The main character's just found out some brilliant news or something via a letter they've received and now they have to go somewhere, and this would be playing when they're going somewhere good at th'end:

http://www.youtube.com/watch?v=tyi7F1yrVTc

Cheers