Apple has added some 28 Refurb Macs, display, AirPort, and iPods deals to the Apple Store Hot Deals page. The Apple Store Hot Deals page lists special offers available at the online Apple Store, and the latest addition points to all the refurbished Apple products being offered.
As of this writing, there are multiple offerings for most of Appleis major hardware categories, including PowerMacs, iMacs, iBooks, PowerBooks, iPods, AirPort (note that this is not AirPort Extreme), and Appleis LCD line. The iPod offerings include Mac and Windows units.
Refurbished products from Apple are returned items (for whatever reason) that Apple has fixed, or replaced components on, or otherwise made whole again. Check the specs for whatever unit you may be interested in to make sure you are getting the unit you want, as not all refurb offers are for the current generation of products.
To find the refurbished offerings, hit the Apple Store Hot Deals page at Appleis Web site. This particular deal is currently the in the second row, labeled "Special Deals." That link takes you directly to the current refurbished offerings. Note that refurb products are only available while supplies last. Apple also notes on the refurb page that the products are covered by a 1 year warranty, and that additional AppleCare support can be purchased.