His work spans a nice array of genres and styles, but his always managed to bring something new and wonderfully quaint or mysteriously odd to the material. Here are some of the posters he did for Marvel in 1990 that illustrate the point (see Fred Schiller's post for more):
[Moebius images via Fred Schiller]
But it is pieces like these that really inspire me, fascinating worlds full of detail, yet to cleanly presented. The sense of proportion in the subject and the frame is inspiring.
[Moebius images via Quenched Consciousness]