Super Mario Series Warpless Relay Race in 2:47:12 is an epic run of three teams through all of the Super Mario games on the NES ending with Super Mario World. It's a nail biting race and the end is surprising as it was quite close with all teams coming very near to each other.
Kingdom Hearts II Final Mix by Bl00dyBizkitz in 3:02:00 might as well be called "The Disney Singalong Run" because during this 3 hour Kingdom Hearts showcase different runners sing through such songs like Gaston, Part of Your World, A Whole New World & Be a Man. It's a really fun run that shows off the spirit of Summer Games Done Quick and brings the spreedrun a little closer to something you'd see in a Jerry Lewis MDA Telethon.
G.I. Joe: The Atlantis Factor by toad22484 in 9:52 is just a solid speedrun of a classic NES game that doesn't get as much love as I think it deserves. It's really quick too so well worth jumping in to watch.