Distro - GnackTrack
GnackTrack is an open and free project to merge penetration testing tools and the linux Gnome desktop. GnackTrack is a Live (and installable) Linux distribution designed for Penetration Testing and is based on Ubuntu.
Backtrack is not only a single player in the field of ethical hacking, so you can try some other distribution as well, if you are Gnome lover than must try this, however backtrack 5 is also available on Gnome platform. Just like backtrack, Gnacktrack comes with multiple tools that are really helpful to do a effective penetration testing, it has Metasploit, armitage, wa3f and others wonderful tools.