I've never seen them before. And hope I never will do again. They actually remind me a lot of the completely random java applets showing weird swirly graphics that you'd get on crappy personal webpages in the late 90s. They're just saying "Hey, look at this new technology we've got! Isn't it cool!" and not actually doing anything useful. You can't (or at least, I can't) discern anything useful from the little images. They just sit there and get in the way. Grr.