Doug Bowman has put his SXSW presentations online: Stopdesign Presentations: South by Southwest 2004.
Well worth a look.
Dave Shea showed off some of the award-winning CSS Zen Garden, including a handful of his favorites (and one as-of-yet unreleased design). I hope he at least blogs a list of the ones he showed since I wasn't able to track them down. UPDATE: Dave's notes are online and also for the CSS: Good Bad and Ugly panel following.
Dan Cederholm showed off his image tab rollover techniques, which seem to me like they are widely known by now. He promised to put his presentation online later and I'll update when he does.