I've always maintained that a good Dashboard widget should be simple with a well-defined, useful purpose that requires it to be close at hand. The Refurb Store widget meets my desiderata perfectly. All it does is display the latest deals from the US Apple Store Special Deals section on refurbished equipment. Having the deals in the Dashboard is a great way to keep on top of new stuff so you can jump right on them when they appear. I've always had good luck with refurbished stuff from Apple, all of which carries Apple's normal warranty.
The Refurb Store widget is a free download from Widgetinfo.