I am not a developer but I can only imagine the frustration of not having a simple template to follow for the new FBML tabs. Lo and behold the new 520 Grid System!! If you're used to the traditional 960 Grid System this will come easy for you.

Developer, Goran Mitic, found a way to integrate HTML and CSS for full functionality (and well, quite impressive) FBML tabs. The 520 Grid System takes the guess work out of formatting and allows for more time to be creative.

What is on your Facebook's FBML tab?