We found ourselves generating a lot of custom tabs for Facebook that needed more capability than previously exposed via Facebook’s FBML tool. When Facebook removed support for their FBML tool, altogether, we started piggybacking many custom designs onto our “Runway” tool.
With Runway, users can place fully custom HTML and JavaScript, embedded links to existing websites, or static images on their Facebook pages with ease. Showing different content to fans and not-yet-fans is also possible with the flip of switch, which makes building a fan-gating experience quick and painless.
You can experiment with Runway, now, but you might be best served by waiting for our full-scale rewrite of the system that will support embedding graceful landing pages anywhere you can imagine.