Vuurmuur 0.8 Beta 2 Released

Beyond the desktop: Ubuntu Linux's new Head-Up Display
Linux and Open Source: "This new interface, which will first appear as a beta in April's Ubuntu 12.04 release, is called Head-Up Display."

Linux: 20 Iptables Examples For New SysAdmins
nixCraft: "This Linux based firewall is controlled by the program called iptables to handles filtering for IPv4, and ip6tables handles filtering for IPv6."

First Look At Ubuntu Linux 11.10 'Oneiric Ocelot' Beta
Lifehacker: "Here's a look at the biggest changes in the newly released beta."