Well I said that this is the best site I have seen for shade edibles in that other thread. Might as well say it here too! Thanks so much, now I just have to pare down the list of 50 different berries and trees I want, hahaha!
A great group of edible plants for shady areas are the waterleafs. Here in western WA we have Pacific waterleaf (Hydrophyllum tenuipes) but there are other waterleafs depending on where you live. Waterleafs do great in full shade and once established will spread and fill in. They're a great early spring green and can provide greens through the summer. Though later in the summer their leaves are tougher.
I've been transplanting Pacific waterleafs into my shady areas each fall/winter and I'm starting to get some nice patches in some deep shade areas.
I really like the flavor of the leaves and they can be eaten raw or cooked. You can also harvest younger root tips which are supposed to have a flavor that is similar to Chinese beansprouts. My patches aren't big enough for this harvest but I want to try it soon.
Cultivate abundance for people, plants and animals - Wild Homesteading
I've read in many places that hostas are edible when the leaves are breaking through the ground. I have an old variety that reseeds everywhere. So theoretically, if I were to catch the emerging hostas at the right stage, I could have a magnificent feast. Of course I've yet to try them, so not sure how palatable I'd find them.