At K4M, we decided that amaroK's context view should get a more prominent place. After some discussion, a tabbed Playlist/Context/Wiki/Lyrics view seemed to be the way to go. So we just did a dirty hack to try it out:

This could somehow work, but Florian from Open Usability pointed a lot of problems, and we haven't been satisfied with the huge number of tabs either ("4 is just too many" is a recurring theme here). So we did a second try using a splitter:
This showed that actual code for experimenting is much better than just mock-ups. And it also showed us that we prefer this Kmail-like look - expect this to see in one of your next amaroK installs!