I think I might be done with collections. I can't work up any enthusiasm for iterators, or java.util. decorators, and I think I have the basic functionality all in place. There are a number of perhaps pointless ways in which Colt diverges from Java collections, particularly in the area of return values from things like 'put' and 'remove'. If anyone can stir up an opinion against the current state of the code, I'm game to make it more like Java collections.
Otherwise, give or take bugs, I'm ready to watch Dawid render all this moot.