I've got it too! Really weird.
The first thing I did was to go to another computer (not the one I'm broadcasting on) and see if my signal was coming through OK, complete with song titles on the Winamp player.
Yes, I'm still broadcasting, with the same 12-14 listeners (puny, huh?) that I had when the problem first occurred. But take a look at the Shoutcast directory! There are only about 900 stations ("servers") listed when there are usually several thousand.
This is a Shoutcast problem, everyone!
Now, where's my sack of tomatoes to throw at 'em ??!!!
I thought about restarting the server, but after reading your comment, I decided it probably wouldn't work anyway.
What gives at Shoutcast, anyway?