I wrote in a recent report, that companies should have a blogging policy to provide guidelines for employees who want to have blogs. This primarily relates to employee's personal blogs and lays out the guidelines of what the company expects. As expected, policies will vary greatly depending on company circumstance. Here are a few examples and also, my variation.
Sun Microsystems' policies about employee blogging: "You are encouraged to tell the world about your work, without asking permission first, but we expect you to read and follow the advice in this note."