Thanks for posting some preview videos.
I'm having difficulty viewing the "Keymap 1.5" preview videos, it could be a quicktime issue, can you please check this. (i.e. I can't play the first video, the second video plays, then halts, and there no controls for the QT video appearing on the player, which is odd).
I just updated QT to version 7.5.5, which is the latest version. But I'm still having difficulties viewing the preview videos.
Please note, that I have no problem viewing the other preview videos on your site, so this is mainly an issue with the "Keymap 1.5" preview video. Hopefully this can be easily fixed.