You betcha! The Media Law Resources Centre published a list of current US lawsuit against bloggers. (Via Whatsnextblog). There are been some cases too in France (in French) and Singapore (with a happy ending).
Based on my limited legal knowledge, these are the common blogging legal pitfalls I identified:
- Breach of copyright: reproducing someone else content without permission. Grey area since bloggers often reproduce articles to comment on...
- Breach of employer's contract, especially releasing proprietary or confidential information.
- Libel: you are insulting and causing prejudice to someone (the plaintiff must show that he/she occured damages).
- Publishing false or malicious information (for example to get a share price to rise or spreading false rumours about a product being defective to kill a competitor's sales...)
Apparently, you could be sued because of the comments posted on your blog too...
The Electronic Frontier Foundation has a legal guide for bloggers (this is based on US law only).