Even Dilbert is warning you about bad mouthing your company in your blog. Here is the post from Blogwrite for CEOs.
"You know this topic is mainstream when you see it in Dilbert. See last week's comic strip here. The strip touches on the thorny legal issues related to employee blogging. (Thorny, that is, for the employer. In most states, a company can fire an employee for any reason... but you really don't want a rep as a company who fires your bloggers.)"
Don't be a Dilbert. Never bad mouth your company on your blog. Anything you say can and will be held against you in your office.