Files have been moved to sourceforge : http://sourceforge.net/projects/ingeniweb
It is pluggable, which means you can make it support new file types.
Plugins package (ZAAPlugins.tar-xx.gz) is separated from Core component package (ZAttachmentAttribute-xx.tar.gz)
A demonstration component is provided for CMF/Plone (ZAAPloneDemo-xx.tar.gz)