Don't know if this only happens on my desktop, but when running SMPlayer (v 0.6.8) in the background while viewing this forum using the Classic Dark Theme, the black turns transparent and allows you to view the video behind the text. It's a really neat effect and allows you to get two things done at once.

Don't seem to happen with the MPUI frontend. I'm running Win XP w/ IE 7. Yea, I know, I should get a really operating system & this is probably the root cause in why I'm getting the effect, but it's enjoyable just the same.