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There are games where an acceptable "move" is a pass, where the board doesn't change at all... and it is still called a move.
This case is not so radical: the piece does move. Philleas Fog did "move" around the world, even if it ended up where he started ;)
Pafl: I don't see why pgn-programs would have a difficult time with that (but then again I've never used one and am not quite sure even what is is for). I mean, if they're flexible enough to allow moves over the side of the board why not a move to the same position? :) (que ! was not part of the notation, mind you - just my way of showing surprise). Do these programs do any type of validation on the moves made?