This TableDnD plugin allows the user to reorder rows within a table, for example if they represent an ordered list (tasks by priority for example). Individual rows can be marked as non-draggable and/or non-droppable (so other rows can?t be dropped onto them). Rows can have as many cells as necessary and the cells can contain form elements.

http://www.isocra.com/2008/02/table-drag-and-drop-jquery-plugin/

Can serialize the row ids for AJAX updates. Has a nifty ability to lock dragging inside multiple tbody's in the same table.

[2 cents] If you've got multi-column data you want to drag up and down, then serialize to your server, this looks great. Implementation seems thorough, docs are pretty good. Wish I'd had this for some arcane tablerow sortables I hacked together a couple years ago with straight javascript.