So going here:
http://www.penny-arcade.com/comic/2003/03/24
brings up today's comic and trying to go directly to it here
http://www.penny-arcade.com/images/2003/20030324h.gif
brings me nothing.
A couple other people had the same issue when I asked them to try.
Posts
http://i.imgur.com/TjJxM.gif
It looks like the linking schemes for the actual files themselves on PA has changed. The comic on the 26th, for example, does not still follow that link convention either. Odd that it's suddenly gone.