<video> tag is probably the biggest change, but I still remember YT used SWF/FLV before then (and likely could still do today). However, it's clear that the de

<video> tag is probably the biggest change, but I still remember YT used SWF/FLV before then (and likely could still do today). However, it's clear that the devs are mainly composed of trendchasing sheeple who have drunk the Goog-Aid and are addicted to newness and reinventing wheels to make them square... because they have to justify their existence.