Cheap, connected whiteboards that feel snappy, cheap conference mics that can cover a mid-size room while filtering out the reverb, always-on video communication tools (@TandemHQ is going into a good direction there).

All in all, most remote communication is still going through a single, small screen, that seems very limiting to me.

Do you know of a tool which allows two (or more) people to share their screens with each other at the same time?

i.e. A can see (at least) one of B's screens, and B can see (at least) one of A's screens at the same time as talking to them.

That's the tool I'm missing to be able to work productively remotely.