One that I started using recently, great for priest, mage, shaman or anyone who has to dispell debuffs in a party.  This will clean whatever debuff you can from anyone around you with just one click of the button.  

[url]http://www.curse-gaming.com/mod.php?addid=643[/url]

After you install the mod you just have to make yourself a macro with the command /decursive in it.

Just click on this macro and it'll try to clean anything your class can clean from people.  Decursing is fun!