There was a google tech talk given by Quicklaunch (that this article is about) that was reasonably interesting which also covers other methods and why they are

There was a google tech talk given by Quicklaunch (that this article is about) that was reasonably interesting which also covers other methods and why they are insufficient if you want more details: http://www.youtube.com/watch?v=1IXYsDdPvbo http://www.youtube.com/watch?v=1IXYsDdPvbo