From the Department of Twitter May Be Useful for Something, we learn about the SideSwipe Spatula Mixer Blade (Cook's Illustrated's Christopher Kimball tweets it "works great"), a tricked out replacement for the standard Kitchen Aid mixing paddle.
Made of reinforced nylon with silicone "wiper fins," the attachment is designed to reduce hand scraping with a spatula. The blade is configured to mix ingredients horizontally and vertically, directing the contents downward and wiping the bowl clean as it rotates. Its creators also claim that it allows chunky ingredients to be mixed easily without being crushed or jammed against the bowl. $24.95 to $29.95, depending on the size blade that will fit your mixer model, at the SideSwipe Store.