There is an interesting article in the October issue of the Duke Law & Technology Review entitled, When is Employee Blogging Protected by Section 7 of the NLRA? (2006 DUKELTR 17)
From the article:
Blogs present courts with a new context in which to strike the balance between employee and employer rights. This iBrief focuses on employee blogging during personal time without the aid of an employer’s property. The iBrief recommends that courts recognize employees’ criticisms of their employer on blogs as protected concerted activity, and argues that existing case law examining unfair labor practices readily applies to the blogging context.