If your house is smelling a bit funky, why not kill two birds with one stone. Vacuum your carpets while deodorizing the air. A company called Robot Add-ons has a cool Roomba accessory in the form of a air freshener that mounts onto the vacuuming robot. The RoomAroma add-ons will set you back about $14.99 here. Yep, a clean house that smells good as well.