From Aaron Swartz:

Here's an annotated version of the schedule from the Emerging Technologies 2002 conference. Under each session are links to the blog entries about that session. If I didn't include yours, send me an email...
You know what would rock for something like this? Provide a conference schedule, with each event in the schedule as a URL-addressable page or anchor within a page. Tell bloggers to link to those URLs when blogging about a particular event. Grab referrers and display links back to blog entries on those pages and on a summary page like Aaron provides.

Automatic conference annotation, and you don't even have to worry whether Aaron included your blog entry or not.