Casie Becker: If you're looking for a starting guide for your own experiments growing in the shade, you might look into what local nurseries do in the summer. Around here, summer shade houses are just as important as winter greenhouses in keeping plants going. The professional operations have already done the trial and error to determine what percentage of available sunlight is actually necessary for different plants in our area, as well as how much light is too much for other plants.
I think I've wandered away from the topic of heat tolerant vegetables for this. If you want to continue this discussion, I'm posting the rest of what I started to say in this thread http://www.permies.com/t/8757/organic/growing-shade#488464
I have found Manzano/Rocoto pepper (Capsicum pubescens) do best in significant shade and this also shelters them in the winter since they are a long lived perennial pepper.