As we transition to the new Hyland Community, some post links may be temporarily disrupted as we finalize redirects. We apologize for the inconvenience and are working to resolve this as quickly as possible. Details.
Quick 15 mins install from tar: http://forums.alfresco.com/en/viewtopic.php?f=8&t=16249&start=0&st=0&sk=t&sd=a#p53296
mkdir ImageMagick
ln -s ImageMagickLocation <Alfresco>tomcat/ImageMagic