It really depends on the city you live in, what you're area of expertise is and if you're freelancing or looking for a "real" job.

I live in Berlin and I know Nokia is currently on a hiring-spree here (it's funny, because, the river is called Spree:) I know a lot of smaller companies in town I could ask who might need someone, again depending on what you do. Earlier this year I did some freelancing for the Telekom in Darmstadt, they have offices in Köln too.

Other than that you probably should be looking for jobs on these sites:

http://www.xing.com/ http://www.gulp.de/ http://www.projektwerk.de/ http://www.designerdock.de/