Well I really enjoyed creating the MIX 2011 PlayOn plugin that I decided to do the same for TECH.ED 2011. I am going to do a bit more research and see if in the next release I can provide a folder for each year as they have published all of the archives for TECH.ED and MIX back to 2008.
When you access the TECH.ED 2011 channel you will see it grouped by All Sessions - Provides a entire list of all sessions, By Category - groups each of the sessions based on the category it falls under, By Speaker - groups each of the videos by the speaker