I use CoolLine:
http://www.wowinterface.com/download...-CoolLine.html
What do you want a cooldown addon to do for you? Do you want numbers on the buttons to add a numerical indicator to the swirl graphic? Do you want it to announce when the cooldown is up? Do you want icons? Bars? Tell you when to cast something? All of these things are possible and have addons that do them.
Check out this download category:
http://www.wowinterface.com/downloads/index.php?cid=112
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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