While that is a smart hack, user should be informed of what is going on. I don't think that is a good design decision. Danger of disconnection in bandwidth limited networks!
Isn't that against youtube's api tos? I thought you had to display the video for the user.
Anyway, I like the site.
i guess you're right... but i don't give much importance is something I've done in a couple of hours to have fun without any purpose of making money, the source code is available on github ;) https://github.com/miquelcamps/pin