There's DVG club information on the above website. I don't have the url handy, but there's also the USA schutzhund clubs..you have to fight a lot of prejudice if you don't have a GSD with them a lot of the time, tho.
I'd be careful about getting involved with any trainer offering "schutzhund training" that isn't affiliated with a legitimate schutzhund club through one of these two entities. There are a lot of yahoo's out there doing bitework that don't have a clue. They can create dangerous situations and do a lot of damage to a dog.