JavaOne Technical Sessions in multimedia, free with registration
Some time ago, Sun released the PDFs of the 2005 JavaOne technical sessions. I've been using them with Apple's spotlight feature to search for words across sessions ("Hibernate").
Sun has now released the 2005 and 2004 technical sessions with slides synchronized to the speaker's audio and including a full-text transcript of the speeches.
Viewing the sessions requires a free membership in Sun's Developer Network (SDN), and a browser with Flash player.
The general sessions had previously been released in video (RealVideo) here.