Blogging for Business–What pushes the adaption curve?

Stuart Henshall in Unbound Spiral asks: “How many bloggers do you need to change a company? How many newreaders (subscribers in a co) do you need to change information habits?…How do we seed the movement? Alternatively, if you are already a blogger in a business how do you determine the tipping point is near? How do you decide that blogging may really be ready to rock your corporate world? ”
Stuart also wonders if corporate newsreader users are more likely to become bloggers themselves.
While Stuart’s post is elegant and smart, and he makes going points, the realities, IMHO, are a bit different and the factors for adoption run along different lines:
1) Internal vs. external: Are we discussing internal or external blogs? Blogs intended for the public a la Jupiter Research bloggers who are essentially marketing their services, or blogs that give us that behind the scenes, eating sushi in the locker room frisson. The Microsofties working on .NET seem to be reveling in their ability to blog, relying on us voyeurs, as well as their peers, to magnify their smartnesses.
2) Intranet vs. extranet: Blogging behind the corporate firewall is quite different that being out in public…I think companies would be hesitant to do any external blogging that isn’t marketing related outside of the fairly unique software development culture of the West Coast.
3) Workgroup blogs and wikis:: Blogs by one person are quite different that group blogs, project blogs and wikis. I have heard many corporate people express strong interest in Sharepoint, which they understand to be both a document manager and a collaborative workgroup tool. It would be great to see blogs become standard for workgroups and projects inside companies, and I do think that will come.
Staurt, thanks for the great questions.