IFrame vs FBML Facebook pages

Choosing between an FBML or IFrame Application
http://wiki.developers.facebook.com/index.php/Choosing_between_an_FBML_or_IFrame_Application

http://www.stevetrefethen.com/wiki/Facebook%20application%20development%20in%20ASP.NET.ashx

http://www.stevetrefethen.com/blog/DevelopingFacebookApplicationsInCWithASPNET.aspx

Resizable IFrame
http://wiki.developers.facebook.com/index.php/Resizable_IFrame

Required by resizable IFrame
http://wiki.developers.facebook.com/index.php/Cross_Domain_Communication_Channel

IFrame Resize Demo
http://apps.facebook.com/wzhu_public_resize/

IFrame Url
http://wiki.developers.facebook.com/index.php/IFrame_Url

http://developers.facebook.com/news.php?blog=1&story=152

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Using IFrames in FBML Canvas Pages and FBML in IFrames

If you're using FBML for your canvas pages and you decide you want one of your pages to be rendered in an IFrame, don't use fb:iframe for that. Instead, you should use the fb_force_mode querystring parameter to switch modes which will accomplish the same thing without incurring a round trip to your server just to fetch the fb:iframe tag.

Similarly, if you are using IFrames for your application but want some particular page to be an FBML page, you can use fb_force_mode to force a switch to FBML. If you find documentation that advises using fb:iframe for switching from FBML to IFrame mode, it was probably written before fb_force_mode was released; we should have all those instances cleaned up soon.