This is at least the fourth or fifth time that I’ve had a OS X 10.6.7 kernel panic that said “BSD process name corresponding to current thread: Canon IJ Network” (what I just saw a few minutes ago on my work MBP) or “BSD process name corresponding to current thread: CIJScannerRegist” (seen in the past).
I am very suspicious of the quality of Canon’s printer/scanner drivers for Snow Leopard (also see this earlier post of mine and this one too).