I found this to be an amusing post. Essentially Blizzard is selling decommissioned servers to benefit St. Judes. You get the blade, an etched plexiglass top, and a side panel explaining what realm it was running and when. A nifty look at the specs that go into your gaming pleasure.
The article is about three pages and has some run downs of the investigation on what he picked up. Plus more pretty pictures.
Activision Blizzard was upfront about the blades being sold as-is and any attempts to fire one up is at the discretion of the bidder.
If you are curious here's Blizzard's ebay profile. The auctions appear done for the moment, and the servers were running $100-300 a pop.