So I tried the KDE Twitter plasmoid. But Twitter is really not so important to have it on the desktop all the time. In addition KDE Twitter provides basic Twitter access only. There is no possibility to access other services like identi.ca or an integrated access to twitpic. I wanted a Twitter client that is not restricted to just Twitter, but lives in the system tray, is running unobtrusivly in the background, but always there at a keyboard press to publish a thought.
As a Linux user the search was over pretty quickly: You have a problem, you google an Application to solve this problem and a nice soul has already the answer for you. Then an apt-get install and you're happy.
In case of Twitter my solution is Choqok.
Update: In case you do not get updates anymore upgrade to Choqok 0.6.1.
