I was looking around how to utilize jQuery for all the HTML5 features that are coming to great popularity, so here is what I have found:
JQuery HTML5 video player
oiplayer is another HTML5 player
JQuery dataset
jQuery HTML5 panoramic photo rotation
Must say, there is not much there at this point. Despite of all the buzz that HTML5 is getting these days, JavaScript being it's language, I would expect more people showing off what this new technology can do.