Fighters can Mark enemies with ranged weapon attacks (nowhere under the Combat Challenge heading did it say Marking was limited to melee). No, they won't hit with the consistency or damage potential of the Ranger, but those penalties the Fighter's inflicting on his target for that target attacking others can't exactly be ignored.
Rogues can Sneak Attack with crossbows and slings if they get Combat Advantage. Probably with other ranged weapons, too, with some feats (which have been alluded to).
The Rangers may get all the advanced tricks, but other classes will definitely get use out of them, too.