Don't think the Science Fair Keynote is available on the web. As far as I know you will only be able to watch Jensen's Financial presentation. This is a good thing in my view...likean executive summary on what the financial impact will be from the new businesses.
If you can watch the technical stuff please let us know how. Might run it as background noise.
Note: Look at the ticket prices for the conference. I actually think Nvidia breaks even on the conference. Remarkable!