Jared Spool and his usability business UIE are offering free access to 12 online seminars on a range of usability-related topics if you register by 14 March 2011. They're available to download en masse, as well as accessing online.
Each session consists of an MP3 audio file and a set slides in PDF format.
All you need to do is submit your email, and optionally choose to receive his (often excellent) emails on usability-related topics.
I've already done it and now have nearly 500MB of audio and slides to review at my leisure.
Register for 12 free usability seminar recordings from UIE.com