See:

* http://stackoverflow.com/questions/3987934/swipe-to-delete-uitableview-help
* http://developer.apple.com/library/ios/#documentation/userexperience/conceptual/tableview_iphone/ManageInsertDeleteRow/ManageInsertDeleteRow.html
* http://eatmyrandom.blogspot.com/2009/05/swipe-delete-from-uitableview.html