I have been working in the last weeks in the removal of the last pieces of KDE 3 from the Debian archive and I have found there are a lot of packages that is sad having to remove.

If you are looking for a good idea/excuse to learn and improve your KDE 4 / C++ /Qt4 skills, have to do a small application for school or you just feel like some useful coding, here is the list:

creox - real-time guitar effects

kbarcode - barcode and label printing application for KDE

kbiff - KDE mail notification utility

KKBSwitch - keyboard layout indicator for KDE (see this post also)

kmyfirewall - iptables based firewall configuration tool for KDE

kpogre - a graphical administrator tool for PostgreSQL

kredentials - KDE taskbar applet to update kerberos/AFS credentials

ksociograma - technical educational software to make sociograms

ktechlab - circuit simulator for microcontrollers and electronics

qalculate-kde - Powerful and easy to use desktop calculator - KDE version

score-reading-trainer - trainer for reading music notes

Note that I do not list here software whose port in KDE 4 is being developed although it is still not finished and therefore it is not packaged in Debian.

By the way, even if all those packages are being removed from Debian testing and unstable, they will remain in Squeeze, so you can keep using them or install it from there.