2. Robert Scoble, Microsoft employee and blogger, has 20 rules for corporate blogging, beginning with “Tell the Truth.”
Other key points:

• Be honest & transparent
  
• Acknowledge mistakes
  
• Be an expert on your topic, or link to other experts
  
• Know your web technology
  
• Pay attention to leading voices and sites, such as Doc Searls and Slashdot
  
• Link to your competitors and say nice things about them
  

3. Mark Jen is a former Google employee who was fired for posting company information on his blog, 11 days after he started (the blog and as a Google employee). He's now at Plaxo, complete with blog, and he and Plaxo are creating Internet guidelines for employees.

Mark Jen/Plaxo blogging guidelines:
While we encourage open communication both internally and externally in all forms, we expect and insist that such communication does not substantively demean our environment. This means that constructive criticism — both privately and publicly — is welcome, but harsh or continuous disparagement is frowned upon.

Externally communicating about aspects of the company that are part of your non-disclosure agreement (partnership deals, earnings, upcoming unannounced features, etc.) is ALWAYS forbidden, however, and grounds for immediate termination and legal action.

Specific policies
7. You may not post any material that is obscene, defamatory, profane, libelous, threatening, harassing, abusive, hateful or embarrassing to another person or any other person or entity. This includes, but is not limited to, comments regarding Plaxo, Plaxo employees, Plaxo’s partners and Plaxo’s competitors.