I know there was another rasterbator thread bouncing around but I just thought I'd share this.
I was trying to figure out how to download the actual rasterbator program and run it on my mac so I could do high-resolution rasterbations instead of being confined to the web rasterbator which only lets you go down to 7mm dots (which is still pretty big and choppy).
I came across this program http://posterazor.sourceforge.net/index.php?page=download〈=english
I haven't printed anything yet but it seems pretty legit. If you make something with this program post a pic I'd like to see ita