This simple extension displays related message threads from aiqus.com Q&A site on the main Intro to AI course site in context of units and homeworks.
It can be installed from Chrome Web Store from https://chrome.google.com/webstore/detail/monhlnpmmijealhaapfbpbgcpaapjemb.
Read more at http://en.ig.ma/notebook/2011/chrome-extension-for-ai-class-forum.