There appears to be some confusion in reaction to a Think Progress post and a recommended diary based on it. Both the post and the diary begin:
By a vote 76-22, the Senate passed the Lieberman-Kyl amendment, which threatens to "combat, contain and [stop]" Iran via "military instruments."
But this is not true, as an update to Think Progress, also posted in the diary, points out. The two paragraphs from which these quotes were taken have been entirely removed from the amendment. The amendment still designates recommends designation of (h/t: Little) Iran's Revolutionary Guards forces as a terrorist organization, however, and that does take us closer to military action against Iran.
UPDATE: The Carpetbagger Report includes more about the current version vs. the earlier version.
UPDATE 2: As lysias points out, if Bush wants authorization for war against Iran, he can already claim it from the AUMF's that have already been passed.