Square foot gardening and layering of crops always helps. You can grow more cool and shade loving plants along the base of larger plants...things like lettuces, radishes, other greens.
I REALLY LIKE some of those ideas @Beekissed! Thanks for posting those pictures. I want to get some of my squashes up off of the ground this year, and will be watching for different ways to trellis things. I've got the wood and the fencing to make some of these ideas possible. Thanks!