I love this list from AllFacebook.com.

Some of the highlights:

• Go steady. It may take a little more time, but it’s worth it. Don’t expect instant results or blow all your enthusiasm in the first few days, but slowly progress and make progress.
• Contact your fans directly. Treat each one as a new business lead. Greet them personally, and connect with them. This is a nice idea!
• Don’t spam. I’d include in this, things that are too promotional in nature. People don’t want to be hard sold things on FaceBook!
• Use incentives. Of course, give people a reason to connect with you!
• Keep fans entertained. Post occasional entertaining statuses.

The full story: www.allfacebook.com/2009/07/facebook-small-business/