if you want to try something with a clean interface, fast, and an excellent range of security tools please don't hesitate to download nUbuntu.

About Nubuntu

nUbuntu is a project to take the existing Ubuntu distribution and remaster it as a LiveCD and Desktop distribution with tools needed for penetration testing of servers and networks. The main idea is to keep Ubuntu's ease of use and mix it with popular penetration testing tools. Besides usage for network and server testing, nUbuntu will be made to be a desktop distribution for advanced Linux users.