The latest stable release of OSGeo-Live 7.9.
An Xubuntu based bootable DVD, which also includes windows and mac installers. It can also be copied to an 8 GB bootable USB thumb drive. Verify your download with its md5sum checksum: http://download.osgeo.org/livedvd/release/7.9/osgeo-live-7.9.iso.md5/download