The mysterious X-37B has returned from orbit and its secret mission. Another X-37 will soon go back up again.
Personally, I hope that "they" scale it up to allow humans to fly in it sometime in the future.
Ref. Wired.com/Dangerroom (http://www.wired.com/dangerroom/2010/12/air-force-on-secret-space-plane-nothing-to-see-here-move-along/). Photo comes from same article.