See the Kubuntu 12.04 LTS Release Notes for a technical description including known issues.
Built on Ubuntu's core and polished with KDE’s applications and workspaces, Kubuntu 12.04 LTS is a grand example of friendly, fast and beautiful software. We recommend it as the perfect OS for casual users, students, Linux gamers, software developers, professionals, and anyone interested in a free, open platform that is both beautiful and useful.

The Fedora Project is pleased to announce the release of Fedora 16 Verne. As always, Fedora continues to develop and integrate the latest free and open source software. The following are major features for Fedora 16: enhanced cloud support including Aeolus Conductor, Condor Cloud, HekaFS, OpenStack and pacemaker-cloud; KDE Plasma workspaces 4.7 and GNOME 3.2; a number of core system improvements including GRUB 2 and the removal of HAL; an updated libvirtd, trusted boot, guest inspection, virtual lock manager and a pvops-based kernel for Xen all improve virtualization support."

Nikon Capture NX - easy to use new generation of software for editing and processing images. Through the use of technology exclusive U Point, the program includes a set of powerful tools and four fully customizable workspaces with the ability to save and switch between them to ensure fast and efficient workflow.