Great work! HD will make a great difference, I am glad you have pro hardware and are also dealing with the SEO aspects. Congratulations and thanks for your hard work.
EDIT: I just tested the HD feature with a 720 video.. the results seem to need some optimisation as the fade transitions are a bit blocky (maybe a higher bitrate for the 720 videos during conversion?).
I'm also unable to play the video in firefox and chromium was a bit slow.