Well, here is the final answer. Just created it from the texts in the OpenSource Jahrbuch 2004 to 2008. Took me some hours and some code-snippets from my diploma theses. Just a quick Porter-stemming (which doesn’t work to well with german, I know) and a manually created stopwordlist. There’s definitly room for improvement (better stemming, differential corpus analysis, say agains the gutenberg corpus) but I just need it for putting people in the right mindset.