Pretty much everything except root veggies and greens. Ive used it mostly for tomatoes and vine veggies. It's easy to train the vines over or around the mound.
On a side note...I pulled the wood chips off the top of the bed this late winter and added about 3" of our compost to the top and placed the wood chips back. The only thing I have actually planted this spring is the row of tomatoes you see across the top. Everything else is volunteer. 2 zucchini, 1 yellow squash, 2 cucumbers and 3 of something that I am not quite sure yet what they are. They look like cantaloupe.