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^The Control + Tab doesn't work for me, either be it Safari 3 or Safari 4.

To the OP: You can set keyboard shortcuts via System Preferences > Keyboard & Mouse > Keyboard Shortcuts.

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Just add a new short cut for Select Previous Tab and Select Next Tab and you're set.

PS: With MultiClutch (to configure three-finger gestures) I set those shortcuts to rotate left and rotate right.
 
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