Last year, Oracle didn't make the presentations of JavaOne 2010 available to public for free immediately. Fortunately, this year, you can download the pdf files of JavaOne 2011 presentations (Oct. 2-6) from their site one day after the conference. Refer to the following link:

JavaOne 2011 Content Catalog

Just for the reference, you can find the 2009 and 2008 presentations on the following link:

JavaOne Online Technical Sessions and Labs