While it may work with the current version of the Wow client, LitheTooltipDoctor is no longer being maintained. Please download my replacement addon Tipsy which is being actively maintained:

http://www.wowinterface.com/downloads/info12125-Tipsy.html

Description:
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A simple addon for repositioning your game tooltip. It doesn't change the tooltip in any way and shouldn't interfere with any other tooltip tweaking addons.

Available Commands:
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/ltd show - Shows the tooltip anchor. Drag it where you want and right click when done
/ltd reset - Resets the anchor back to the center of the screen (in case you lose it off screen)