edit> within 24 hours my bitcoin withdrawal went through. - no problem here.
I noticed the same thing today with all my bitcoin withdrawals stuck "waiting to be processed". I'm figuring it might turn out like their warning indicated: (that "large" withdrawals can take up to 24 hours).
...edit... I just saw a post about a long weekend for bitstamp:
https://bitcointalk.org/index.php?topic=38711.msg3446055#msg3446055