I’ve been meaning to get into the meat of this for a while but have been swamped. CV does a much better job than I would have anyway with this screencast explaining the Web 2.0 TDK and some possible uses. I love that you can see whether or not the user has a single or dual core pc and how many CPUs as well.

ISN’s Web 2.0 TDK (click to view video)

*Note: The Web 2.0 TDK is free to download (and royalty free as well). If you have implemented it, please email me so I can let everyone there know that their work is being used.