I know my Avatar says I'm from Florida, but don't be fooled.. I grew up in Tennessee in the foothills of the Smoky Mountains.. So here's my take on the Southern food:
Cornbread! (Iron skillet a must for this one).. And I agree with the biscuits and gravy and fried green tomatoes and okra as well.
Hmm.. some others that come to mind are fried potatoes (my grandma used to make those for me), chicken and dumplings, and my mom makes a homemade chicken pot pie that you'd kill someone for! If you'd like the recipe PM me and I'll send it on..
And for dessert, peach cobbler! (I also have my mom's killer recipe for this one if you'd like it, as well as her how-to's on how to make good homemade southern white gravy!).