Alex Gorbachev of Pythian fame has posted a couple of videos already; one with Justin Kestelyn of Oracle Technology Network (check out the shirt he's wearing underneath) and Richard Foote. You can follow his YouTube channel here.
I also found a video with Tom Kyte from OracleJAPAC (Oracle Asia Pacific and Japan).
You can watch all the keynotes live at LiveStream.
For the old-fashioned, you can follow the #oow and #oow09 hash tags on twitter here. I've already set one up here where I also include any blog or news article related to Oracle OpenWorld.