It's an interesting debate on blogging in response to my editorial. I definitely thing blogging is worth a try. You might really enjoy it. If not, you've tried it.
If you do a professional blog, keep it focused on your career and technical stuff you do. Don't put in interview notes, job offers, etc. Just do the stuff that promotes your career. Any opinions, thoughts, expressions, etc. should be on a personal blog, which can be fun and enjoyable for family and frineds.
Just remember if you post it, it's out there. Especially pictures/video. I know I'm careful not to put stuff up that my wife might not like out there.
For the corporate blog, follow the Microsoft creed: be smart. Don't do something to embaress the boss or the company.