Many others have noted that the PDC Sessions are available online as streaming audio with synchronized PPT and demos, so who do I think I am posting it again? Well, here's my value-add: it's possible to download the Windows Media streaming audio and the demo videos using a free tool called Net Transport. I'm using this to max out my broadband connection as well as letting me relive the PDC sessions I was too worn out to make when I was at the conference, on my daily four hour train commute. Today I spent time on the train with Anders, tomorrow more Don and I'm considering using Doug Purdy's presentation as my new motivational tape to help me get out of bed in the morning.
To start each PDC folder has a file with a 0Media.asx file, which is an xml file containing links to all of the media files in the presentation. Net Transport expands the xml and starts downloading the individual files. It's even possible to pause the downloads. Here's the link for Don's overview of Indigo for example (you can test the accuracy of my transcription of Don's talk at the same time!). Once you've downloaded the files, edit the Media0.asx file to use local paths to the individual files and launch it in Windows Media Player. You'll have to move the slides yourself, but it makes it feel more like a slide night.
If I had more time I'd adapt early & adopter's script to download the slides to download all of the streaming content.