Well, the rule came as a "response" to the pawn being able to move two places in its first move. This was because there was a certain "unfairness" to evading being captured by moving a pawn past the attacked square. I can't think of a smilar situation for bishops or queens, since they won't get inevitably stuck if a piece passes through their line of attack.
En Passant- bishops and queens
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Some of you may or may not be familiar with the traditional chess move, "en passant," but for those of you that are, maybe you can help me answer a question. Why can't bishops or queens perform the en passant move? I don't see any good reason why they shouldn't be able to
http://en.wikipedia.org/wiki/En_passant