I put a trial copy of blackice on my machine today. I've already had 13 attacks in about 6 hours. None of them were serious attempts to get in. Most were just scans for trojans or open ports on my computer. If a trojan had been on my machine, it could have been very ugly for me. The most serious were a couple of weak denial of service attacks. From what I read on the subject, the number of attacks discovered is not unusual for the average cable modem user.
------------------
Looks like a fish. Moves like a fish. Steers like a cow.
------------------
Looks like a fish. Moves like a fish. Steers like a cow.