KDE, one of the two most popular Linux desktop environments, recently announced the release of version 3.5.7. Although the release is mostly bug-fixes, it also comes with feature enhancements and a couple of new features, such as:
1. KPDF shows tooltips for links when hovering on them, displays correctly more complex PDF files like this Firefox advertisement and reacts to the commands for opening the Table of Contents pane.
2. Umbrello now can generate and export C# Code and has added Java 5 generics support.
3. KDevelop got a major version upgrade to version 3.4.1. New features include much improved Code Completion and Navigation, a more reliable debugger interface, Qt4 support and better Ruby and KDE4 development support.
As always, you can get the binaries and source at the website.
On a related note, Munich's KDE-based linux distribution, Limux, has been "certified to meet the international usability standard ISO 9241", by the German certification association TUV. So who says Linux user interfaces suck? :P