While I don’t recommend auto-posting everything to Facebook as you need to have some personality shine through on your fan page, I thought I would start my Facebook Friday blog theme by mentioning one way you can have your post automatically pushed to Facebook.
Networked Blogs is a service & Facebook app I found out about not too long ago after seeing someone in my Twitter stream using it. All you need to do to use it is click the Add Your Blog button on the website and it takes you to their Facebook app where you can add the app then register and syndicate your blog posts to both Facebook and Twitter. Check out their Getting Started Guide for more info.
Also, a sort-of-related-to-the-topic WordPress plugin is Sexy Bookmarks by Shareaholic which allows your readers to share your post to Facebook and many other services you can choose from. You can even choose what order they show up in on your blog. Sexy Bookmarks is what you see at the bottom of each post on this blog with all the logos for you to click on and “Share the knowledge!”