Here are some of the larger or more notable feminist blogs:
Jezebel. Kind of like a woman's magazine, but for feminists. Celebrities, sex, fashion, etc.
Feministe. One of the oldest and largest feminist blogs. Multiple contributors. And some of the best writers in feminist blogging. If you've got a blog to promote, "shameless self promotion Sunday" is a feature on Feministe where you can promote it. Guest bloggers accepted.
Feministing. Geared towards young feminist womensfolk. A younger audience than, say, Feministe. Multiple contributors.
Finally, a Feminism 101 Blog. Basic feminist theory. Also, cheat sheets on how to respond to anti-feminists.
See FAQ.
MediaGirl. Mainly takes on the entertainment and various cultural industries with feminist and progressive critiques.
Skepchick. Geared towards younger audience. Feminism at the junction of skepticism, humanism, and geek culture.
Are Women Human. Written by former Evangelicals. Tends to have a focus on the intersection of feminism and evangelicalism, fundamentalism.