Faraday's scene system.
It's similar to the temproom system many WoD games use, but the added features it has are lovely. Being able to see what scenes are open with 'scenes' (with things like 'location,' scene summary (if set), etc. Being able to jump into a scene with 'scene/join' all help in getting access to RP (I don't have to wait for someone to send a meetme, for example).
The system also allows you to define a scene/set (so no need to page each incoming person). It has a scene/log on the fly, scene/repose (so people can either read the full log to catch up or just the last few; again, no need to page people to catch them up!).
When the scene is done? I just make sure the pertinent info is filled out and I can post the scene.
Done.
It allows me to focus on the RP. I love it. I probably love it the most out of everything she's done with AresMUSH. And I say this as someone who hates logging more than anything.
ETA: Almost forgot. As an ST, the scene/emit function is great. It sets apart my ST poses so that even in a big scene, everyone knows 'oh hey, ST pose!' so it's not lost in the rest and I don't have to do any especial formatting myself.