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