Allow users to select regions on the actual website and drag them across the page, save them later, and close down specific regions and add new regions such as the weather or the news from MSNBC. The same method is used by Google when you click personalised home page and they allow you to add news feeds from google news, the weather, quote of the day, wired magazine, slashdot or even gmail. What method is this called? I am curious because I would like to create a new site using this technology. I know it is something to do with AJAX, but not the specifics. Thanks.