I would love to see chess.com consolidate all it's opening instruction in one place. I'd especially like to see more videos devoted to the different openings; there are some now, but there seems to be little attempt to be comprehensive or systematized. I would also LOVE to be able to play against the computer in such a way that you could set the computer to only play a particular opening or variation, and have it force you to make the correct moves within that system -- an aid to memorization and a great way to practice the opening you want to learn.