1) MoveIt is great for multiplayer games. Number 1 on my list!
2) Named Variable Object because I love having lots of named variables available without having to name them before run-time. The Save/Load function can be trimmed for all I care.
3) OK, low priority, but Fast Function? Or at least some function object. Yes, we can run lots of 1 time loops, but come on.
4) Networking missing links. We have HTTP Get (Text), and Lacewing. We need some way to get images from a URL. I'm sure this is possible with Flash.
If we want to let users upload pictures to our website (that part can be PHP-only), but then load those images directly from their URLs into our game (as avatars, imagine!), I don't think we can yet, and we ought to be able to!
4a) Raw sockets. Jamie is working on a raw socket object next, I hear?