The Green Hornet - by Aurelien Poitrimout - seriously, one of the *BEST* fan films I've ever seen - amazing stuff. Somebody, please, get these guys Hollywood contracts.
It might not have the "cool" factor going for it as much as Batman: Dead End does (a batman vs alien vs predator lineup), but the production value is at least as good, and the fight scenes are better.
Definitely, check it out. Check them both out.
(PS - If you want a smaller, faster file for Batman, catch it on YouTube here.)
(PPS - There were a couple other fan vids to catch if you want, but Green Hornet def was the best. But, the origniating page is here.)