Not working on my iPod Touch 2G running iOS 4.2.1 (the last supported update). I get a poster frame with an overlay saying the file wasn't found/format not supported.
Hmm, it might be that it just doesn't work on that. I have an old Touch lying around somewhere, I'll try that later.
Sorry, I should have pointed out - full screen doesn't work on those embeds in some browsers - mostly Android/Chrome ones. It's a limitation of the core browser by the looks (YouTube videos also won't do it, I noticed). We'll probably just pull the fullscreen button.
Thanks for the testings!
edit: actually, some youtube ones can in some circumstances. Will look into it further!
edit: #2 - oh, the ones that can go fullscreen are old-style embeds, not the new iframe embed. So yeh.