AT&T HTC One X one-click root
Though I can't confirm this personally, since I don't (yet) own a One X, I saw this post today on XDA:
http://forum.xda-developers.com/showthread.php?t=1644167
Plenty of people in that thread seem to have had success. I figured folks here would be interested, especially given the frustratingly locked bootloader on the AT&T One X.

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