I just ran into a post http://www.avivadirectory.com that provides a nice summary of the 12 Laws that define blogging.

They include:

1. Whether to Disclose Paid Posts (If you are paid to post this should be disclosed)

2. Is Deep Linking Legal (how you might be sued if you do this wrong)

3. The Legal Uses of Images and Thumbnails (don’t take other folks images)

4. Laws that Protect you From Stolen Content (What to do if someone steals your stuff)

5. Domain Name Trademark Issues (both what to do if yours is stolen and why Cypersquatting doesn’t work)

6. Handling of Private Data About Your Readers (don’t share it)

7. Who Owns User-Developed Content and Can you Delete it (you don’t and it depends on site rules)

8. The Duty to Monitor Your Blog Comments, and Liability (You are liable)

9. Basic Tax Law Issues in Blogging (if you are making money you have to pay tax)

10. Limited Liability Laws and Incorporating (Form an LLC)

11. Spam Laws and Which Unsolicited Emails are Legal: (Spam must be so labeled)

12. Are Bloggers Protected from Journalism Shield Laws (Don’t bet on it, but maybe)

It closes with a lot of great legal references.

If you Blog you should have this on your favorites list as a resource you will likely use from time to time.