Much of my activity in paddlesports is through the Georgia Canoeing Association, a great club based in Atlanta, but with members living and paddling throughout the Southeast. We put on a lot of clinics each season. GCA is mostly a white water club, but has a flatwater canoe and sea kayak side, as well.
GCA is the sponsor of the Southeastern US Kayak and Canoe Slalom Championships. Check there for information about this year's race.
I have been known to spend some time paddling with the Atlanta Kayakers, a loosely-organized (the operative word is "loosely") group of sea kayak paddlers who do monthly trips around Atlanta and North Georgia and periodic kayak camping trips to the coast. Lots of good info on their website.
I sponsor three or four sea kayak clinics a year. Some are held on lakes in the Atlanta-Athens area, others are held on the coast, around Charleston, SC. The next one will be May 28-29, 2005; click here for more information.
The first two canoe images above show my run through Nantahala Falls at the 1997 Southeastern Slalom and Wildwater Championships. The other two kayak pics show my son Evan demonstrating how to do cartwheels and stern squirts in a ridiculous little boat, also at Nantahala Falls.
Here's a link to a video of a great kayak run. The perfect place for slalom training.
I also teach a white water kayaking course for the University of Georgia's Outdoor Rec Program (GORP). If you're planning to take the course, have a look at the course description.