For the non-developers, you might find some of this interesting, but you may want to start with the keynotes. Even for the developers, it looks as though you will want to be well versed in Visual Studio before checking out some of these sessions as well.
There are over 150 sessions covering all four days of the conference and they are all available to view. If you wanted to make it, do not feel bad, the event sold out in less than an hour, which shows how seriously developers and Microsoft are taking this newest generation of Windows and Windows Phone.
You can stream the videos or download them to watch later. Go forth and develop good apps!
sources: Channel 9 via Engadget