For the people comfortable with coding and uses Facebook may want to consider looking the open source “Facebook Developer Toolkit 2.0”. This toolkit was originally developed by Clarity Consulting Inc for the Microsoft Visual Studio Express Team.
Facebook application development in ASP.NET - http://www.stevetrefethen.com/wiki/Default.aspx?Page=Facebook%20application%20development%20in%20ASP.NET&AspxAutoDetectCookieSupport=1
Sample: Facebook Developer Application - http://www.facebook.com/apps/application.php?id=2345053339
Alternative Options: For those who don’t want to spend lot of time in coding may consider using Blogfuse Facebook App Creator.