This may be absolutely nothing. In fact, that's what I'm hoping.

Take a look at this video of yesterday's launch of the space shuttle Discovery.

Specifically, take a look at about 30 to 35 seconds into the video.

More specifically, look in the upper right quadrant. You see the white thing with the two circles, one on top of the other, so that it looks like a colon?

Is it normal for those things to blow out like that?

I'll put in an email to NASA and see what I can find out.