iframe Tabs for Facebook Pages and the death of FBML

Everyone's very excited about this, well most developers are anyway. All the boundaries we pushed  trying to get FBML to do the things that have been easy with standard web technologies for years  - what a waste of time that was! Er Iframes? Sounds like a bit of an old school hack but this should prove to be quite liberating for most. Has any one done anything or seen anything particularly clever on Facebook yet? Post us some links if you have, I am quite intrigued... More on the Facebook developers blog...