I recently came across this interesting video that gives a tutorial on How to Write a Facebook Application. It’s great for someone looking to start up their own Facebook app. However, if you want your application to stand out in the Facebook Apps Directory then you’d better come up with something pretty catchy because there are more than 350,000 Facebook applications for their 300 million active users. There are also guides out there like Building Facebook Applications For Dummies or the Facebook Application Development Guide.