Gentoo

Images for several Gentoo versions are available.

Size (compressed/uncompressed): 676 MBytes / 3.4+ GBytes
Link:http://sourceforge.net/project/downloading.php?group_id=213555&filename=gentoo_linux_2008_server.7z&a=10503563
Active user account(s) (username/password): root/toor, gentoo/reverse
Notes: Installed from the provided CD, custom (not really optimized) kernel, includes Samba, OpenSSH and some other server stuff you need to configure before use.