Fredrik Wackå categorizes enterprise weblogs:
The reason I draw your attention to this is the important distinction between internal and external. Many articles and posts fail to make this distinction, leading to confusion over what is a corporate weblog. Instead of the next six types Fredrik offers, I'd suggest the simple categorization of if the blog has a single or multiple authors. Inside the enterprise group blogs are more common and oriented towards collaboration. The topic or objective of a blog can change over time, as most things do, and most individual blogs defy categorization.
