I totally aggree with your guidelines. And it's really important to not force blogging in the intranet. Blogging has to fit into the corporate culture. But companies should think about heading to a corporate culture where blogging fits. Then decent blogging could be a way to accompany that way to a new culture. I find your guidelines very valuable so I translated them to german, posted them on my blog (address provided in the URL) and commented them from my point of view. Thought you might be interested in a feedback that some people over here in Germany share your thoughts.