From Deutsche Bank Research comes a study/white paper about blogs (via Haltungsturnen). Surprising source, and I agree with Wolfgang that it is mostly good. (apart from the annoying usage of the wrong article) In a concise way, blogs and especially corporate blogs are explained with pros and cons.
I disagree though with this argument:
Grundsätzlich ist der Einsatz von Corporate Blogs im Kommunikationsmanagement von Unternehmen nur in engen Grenzen möglich.
Certainly corporate blogging has more boundaries than you or me blogging, but I would not argue that usage of corporate blogs is within narrow confines per se. IMO, this is very much dependent on the organisation/company using a corporate blog as communication tool. A toy manufacturer’s blog will experience far less boundaries than e.g. one by PriceWaterhouseCoopers.