Moot posted a new article today:
https://content.4chan.org/tmp/extensions.html
It's probably mainly of interest to people running their own image boards or other servers.
It sounds like their users really want live updating. For now they're throttling clients to 5 second refresh with a simple backoff algorithm, but I wonder if they'll do something along the lines of http://doushio.com/moe/ in the future. Honestly I hope so, but I'd like to see a more refined approach. I think there's a lot of room for innovation in that area.
moot already has a AJAXified Web 2.0 image board.
This is the problem with scripts. People expect too much. Learn to use the tools built into your browsers.