Unexploded bomblets are good for stragglers and those who'd try to come the same way later. No bomb gets everyone. For those who survive (and are probably staggering away from the area), the leftover bomblets can be very effective.

Quite frankly, I'd love to see us use them against those foreign volunteers as soon as they got a couple miles inside of Afghanistan. I suspect that might tame the ardor of subsequent volunteers. I'd even go so far as to video tape it and broadcast the tape over that Arab news station. The message would be simple: "This is what we're doing to the Taliban and those who support them."