Alyssa Milano blogs about baseball.

Margaret Cho vlogs her Sensuous Woman tour and photo blogs getting tattoos.

Pamela Anderson uses her blog to assure us that she's a good mom.

Those are just three of the big-name bloggers on Celebrity Cowboy's list, "66 Celebrities that Blog." Why would people who hire publicists to manage their messages take up blogging? Well, let's see.

In the case of Victoria Beckham's blog, her favorite subject is, well, Victoria Beckham. The latest entry features photos of Posh in Paris, complete with her own fabulously clever captions.

"There's never a taxi when you need one!"

Mariska Hargitay's blog, at her site, mariska.com, includes posts about her, written by others, but Hargitay seems to do most of the posting herself. She shares a speech by Bill Gates, thanks fans for kind words about her Emmy nomination and talks up her Joyful Heart Foundation that helps sexual abuse survivors. Actually, the whole site is pretty cool and makes me like Hargitay even more. As if that were possible.

I'm a fan of Rosie O'Donnell's blog. Her free-verse style of writing turns off some people, but she's funny, raw and self-deprecating. And her passion is unwavering, whether she's praising Jenny McCarthy's work with autism or quoting Joni Mitchell lyrics. Sure, she gets on tangents from time to time, but don't we all?

Jenna Fischer maintains a blog at Pam Beesley's myspace page. The post that earned this blog a bookmark on my browser is The Acting Advice Blog Fisher wrote last year — it's sincere, honest and endearing. And the blog has gone uphill from there.

Other celebrity blogs worth checking out: Kevin Smith's My Boring-Ass Life, Meredith Vieira's Meredith Today, Lily Allen's myspace blog, Wil Wheaton's WWdN: In Exile and Jeopardy champ Ken Jennings' Confessions of a Trivial Mind. And a number of famous folks, including John Cusack, Jamie Lee Curtis, Alec Baldwin and more, expound on the issues at The Huffington Post.

My personal favorite is Good Evening, by John Hodgman, the weird, wonderful Daily Show correspondent and PC on the Mac/PC ads. Hodgman is very, very dry and much of the content requires inside knowledge of hobos. What can I say? Vagabonds make me laugh.

How often do you read celebrity blogs? Which ones do you love — or hate? Be sure to post links with your comments.