Growing up in the south, here are some of the standards I remember at church potlucks, family gatherings, etc.
Chocolate Pecan Pie
Red Velvet Cake
Chocolate Cake (yellow cake with chocolate frosting)
Banana Pudding (usually the cooked kind)
Chocolate Meringue Pie
Gooey Butter Cake (called Chess Cake in my family...Paula Deen's is just like my cousin used to make when I was a kid in SE Georgia)
Chocolate Delight (like this Cooks.com - Recipe - Chocolate Delight
Pound Cake (I have a recipe for a good cream cheese pound cake.)
Sweet Potato Pie
My grandmother's specialty Scuppernong Pie (made from scuppernong grapes with meringue on top......yum!)
If I think of more, I will post them.