Woot! is a deal-a-day site. Been around forever, and was recently acquired by a rather large company you may have heard of.
The deal is real, and good, but keep in mind that Woot!'s refurbs are only good for 90 days. Sure you can do the whole SquareTrade thing, but there is a bit of a difference from buying a refurb from them versus say, Apple (where you'd get a year warranty and the ability to add AppleCare).
Great site though.