Well, the widget I wanted to write for KDE4 to hone my skills was already written (and it seems it was written one of the first, just right after the ubiquitous clock applet :)) - it was a Twitter widget of course.

Now I'm still in this stubborn state, asking myself how do I start writing KDE4 code.
I can't think of anything. (q) Fight Club

Somebody, push me to set KDE4 as default environment.