Snow Leopard, Canon MP620, and Airport Extreme Weirdness

After hours of troubleshooting, a disconnected anomaly was all I could find. For months my Canon MP620 printer worked fine under Leopard and Snow Leopard. My wife's MacBook printed well wirelessly. But, one day her MacBook printing just stopped working. I went through the usual suspects: reboot machine, reboot printer, reinstall drivers, manually clean out drivers and reinstall etc. Nothing worked.