I haven't seen this posted anywhere, so I might as well.

SlackCircus, the production studio behind the 'Splosion Man videos and I have to imagine some of the songs, has a youtube page including the End Credits video, Splode Beneath my Splosion, and Doughnuts, Go Nuts! as well as the various clips from the final boss battle.

I don't recommend it if you plan to actually beat the game, as the suprise is well worth it, but if you don't or already have it's definetly worth checking out. Especially since you can see the credits in HD as opposed to a tiny box.

http://www.youtube.com/user/slackcircus