This open source AJAX Web Portal, www.dropthings.com, has an ASP.NET AJAX Extender which provides multi-column drag and drop for widgets. You can see similar drag and drop behavior in commercial AJAX Start Pages like Pageflakes. The Extender allows reordering of content on the same column and drag and drop content between columns. It also supports client-side notification so that you can call a web service and store the position of the content behind the scene without producing (async) postback.
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