Agility is a fantastic sport for rottweilers and really enhances the bond between dog and handler. There are many excellent rotties in agility, some at the very highest levels.
Tango recently finished 3rd in the finals of the AKC Agility Invitational, held in Long Beach, CA in December 2007 and appeared on Animal Planet.
American Rottweiler Club - AKC Agility Invitational 2007
In a shameless brag, my own rottweiler Sammie won round 1 (jumpers) at the Invitational, and just returned from the AKC National Agility Championship in Tulsa, OK, where she finished 3rd in the challenger round (video on our blog). Yoda and Peaches were the other two rotties there.