Mario Sundar, the Community Evangelist at LinkedIn writes a post about EMC and the 5 lessoned learned in corporate blogging.
1) The right bloggers within your company will find you
2) Non-correlation with titles and blogging capacity
3) Groom bloggers - have an internal blog playground
4) Corporate blogging is an oxymoron - keep it real
5) A community of bloggers
Lesson three was interesting, Jim Cahill at Emerson Process Management at the New Comm Forum also described how his company only got approval for blogging once they tested an internal blog.