Mar 13, 2011
Although Facebook originally announced March 11, 2011 as the cutoff date for creating FBML canvas applications or adding the Static FBML application to your Fan Page, they now say on the developer blog that the cutoff has been pushed back to Friday, March 18:
Starting Friday, March 18th, you will no longer be able to create new FBML apps and Pages will no longer be able to add the Static FBML app. While all existing apps on Pages using FBML or the Static FBML app will continue to work, we strongly recommend that these apps transition to iframes as soon as possible.
Read more: http://www.hyperarts.com/blog/facebook-announces-new-static-fbml-cutoff-march-18-2011/#ixzz1GWDbwZEV