A mirror of the complete NetBSD-6.0_RC2 release archives, i.e. all supported architecture's boot and install files, as well as the source tarballs.
For most people, you will want to make a CD or USB stick from the amd64/installation/cdrom/boot.iso file and put the archive(s) in a place that can be reached by the NetBSD installer, like a CD or DVD, ext2 partition or on a local FTP server.
Enjoy the experience!