I've recently found myself playing with Expression2 a hell of a lot. I know a decent bit of it, and it saves tons of time and space when wiring, and overall cleans up my contraptions when it comes to wire.
That said I can't do that much with it that I can normally do with wire because I'm still learning.
Anyway, I thought it might be neat if some of you could post your ideas and contraptions using E2. Or maybe help people who are just getting into E2.