Nice summary by Shel Holtz of the Internal Uses Of Blogs. This jumped out at me:

I’ve been engaged in employee communication for 28 years. When I started as an employee communications representative at ARCO in 1977, we used manual typewriters, a Compugraphics typesetting machine, and our primary communication vehicle was the weekly newspaper, the ARCOspark. I’ve watched all the advances in communication and few are as exciting as blogs.

He points out some of the internal uses at corporations would be:

• Executive blogs
• Alerts
• Projects
• Departmental
• Business literacy