In order to install the ImageIO-Ext GDAL extensions you have to:
* copy all the jars contained in this package into geoserver/WEB-INF/lib
* properly install the native binary libraries for your operating system

For the binary components and install instructions referer to:
http://docs.geoserver.org/latest/en/user/data/raster/gdal.html

Note: This GeoServer extension is in *possible* violation of the GPL license as
explained in this thread on the Geotools development mailing list:

http://www.mail-archive.com/geotools-devel@lists.sourceforge.net/msg14879.html
