It seems that embedded YouTube videos would automatically stop playing once the user leaves the screen. How annoying when I would like to use the MVs in YouTube as background music.

Oops ... it seems its working fine now. How you feel if YouTube embedded videos would automatically pause once you leave the that particular screen?

I thought this is a Firefox (or Flash) bug.

I noticed this yesterday as I went to open a new tab. Is it working again?

Is a good feature... If you leave the page quickly for any reason, it will pause...
Keith Chan: I suggest you to use Last.fm or a similar service instead of youtube... It's more bandwidth friendly. :)