The most recent space shuttle mission is forever going to be known for the lost tool bag. The bag can be spotted from Earth and has its own websites. Really. See http://www.n2yo.com/?s=33442 as just one example.
That's a shame, because the crew of the Endeavour accomplished a huge amount of work, along with the ISS astronauts, to make the station fit to expand from three crewmembers to six. The ISS now has a repaired solar-wing joint, an advanced water recycling system, its first refrigerator, and a second toilet to go with two new habitation areas. Congratulations to all involved.