Can't print. Arg.

All of a sudden we can't print anything. Have a couple of Macbook Pros, an iMac and two printers hooked up to Expresses through our Airport Extreme network. Printing usually works fine, now, nothing! When we go to print, the macs act as though everything's okay, but the printers don't respond. I tried hooking my macbook pro directly to one of the printers, and still nothing. Mysterious and I can't figure out how to even see what the problem is.

Anybody have an idea?