I’ve highlighted two forthcoming (commercial) HTML5 video players recently and someone brought the OSM Player to my attention. Unlike the others, this is an open source project that media for HTML5, YouTube, Vimeo, and Flash (the Flash video player is the fallback). Like pretty much everything good these days (!), it’s written in jQuery, which means that this player can also be skinned using the jQuery ThemeRoller. The creators behind the Open Standard Media Player have already created a Drupal module for it and are working on WordPress and Moodle versions, too.