That is called the tooltip. You can find something to suit your needs in this download category:
http://www.wowinterface.com/downloads/cat98.html
Some just move it, others alter its appearance and/or the information it displays as well.
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff,
The Tao of Pooh