As mentioned, we do have our own manager for addons available here.
Here is also a guide for installing addons yourself:
http://www.wowinterface.com/forums/faq.php?faq=install
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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