OMG, seriously, I had a long post and quess I was timed out!! ARgh!
Short version:
I really don't think we can possibly be in the same zone as wild_reilly. If so, our planting seasons are different...most of the amazing plants listed are fall/winter plants for us.
I'd add more herbs, if you like: marjoram, thyme, oregano, chives, etc. have all done well in the margins of my garden
Okra
Lemon cukes or Armenian cucumber
more hot peppers (I've had the best luck with seeds from Native Seed Search)
Had beautiful green corn stalks, lovely element in the garden, but waste of space with malformed, 3" corn.
Not so much luck with sweet peppers.
In my book, melons and watermelons are worth it, just for one or two homegrown melons. Problems at my house have been monsoons--just as the melons look amazing and so close to being ripe, the extra rain splits them...and then bugs, rot, etc. set in. Plus birds and packrats tend to get the fruit at all stages, but for me, those few fruit that make it are totally worth the space and water!
Oh yeah, it is a late for seeds, but you know what? EVERY single year I plan to get an early start on seeds, and every single year I end up planting mid-March. This past weekend I started sowing, and I'll wrap it up this week. I get a few toms before the heat sets in, but come late Aug/Sept/Oct/even November the plants are still fruiting!
Happy gardening--I can't wait till my first sproutlets pop up!!