We just got word that as part of a larger effort to improve user experience and promote consistency across the site, Facebook will be modifying Page and Profile layouts by simplifying how identity is managed and displayed.
Changes to the layout will include the following:
• All tab widths are changing from 760 to 520 pixels
• Boxes will no longer appear on Pages or Profiles. This means that Pages will no longer include the Boxes tab, or the boxes that currently exist on the left-hand column of your Wall and Info tab, underneath your Page’s profile picture. You can move the content that currently exists in Boxes to a custom tab.
• Pages will no longer be able to implement iFrames on their Page. Custom/application tabs will be the exclusive integration point for applications on Facebook Pages and Profiles. All custom content will need to be in FBML on a seperate, custom tab.