Because I wanted to test internet telephony I downloaded Skype and tried to get it to work on my Kubuntu system. Unfortunately, the Skype version is only 1.2.0.18, and it does not work well with arts :( That is, using artsdsp it crashes with segfaults whenever I start even a chat, let alone a phone call. This could be worked around by disabling sound in my KDE session, and then the /dev/dsp is open again.