I think the legal consensus that's congealing in the courts and state legislatures is that bloggers have exactly the same rights and responsibilities as "normal" journos.

The First Amendment has many exceptions, including the age-old "yell fire in a crowded theater" chestnut. There are also State Secrets, which are rightfully and justly exempted from free speech. Libel, slander, incitement to violence, the list goes on.

I dunno, posting the identity and home address of undercover police strikes me as serving little or no public benefit while endangering a schlub who puts his life on the line for his community. Don't see the upside, and the downside is obvious.