I like the Selva design VERY much: the yellow/green color scheme is especially pleasing to my eye: cool, but not cold: aloe vera maybe (is it hot in Australia?). The teardrop shapes really do take the rough edges off of things, and I like how the center and right gutters are bigger than the left: you get tight left and then air in the rest. I especially like the discussion of false logic: I've felt until now that we've treated tabs as basically lists lists and not as tree structures with a sense of proportion, which is what I think you've got going here nicely.
