The slides and videos from the Hadoop summit and Data-Intensive Computing Symposium at Yahoo! held at the end of March are online. I missed it completely because I was headed off to ECIR at the time. Better late than never...
There's some really fantastic looking content, check it out if you missed it.
I also ran across James Hamilton's notes from the conference.
More on the videos later... Now if only SIGIR would post their videos online.