Ask HN:what are the best ways to market facebook applications?

I'm recently researching on how to best promote my facebook applications. The best article I could find is www.insidefacebook.com/2007/07/16/inside-facebook-nfo-is-the-new-seo/

Are there other effective ways?

If I want to spend a few marketing dollars to buy some seed users, what are the best ad platform? I tried fbexchange but their server is down and stop the service recently.