I think the best FW product is Zone Alarm. I have an RC1 for evaluation and I too had the True Vector problem. I don't use XP hardly at all so I wasn't too concerned. If you're using one of the RC versions, you may want to wait for the final version to go retail. There may be something in the RC's that won't work with ZA right now. I've heard of people with new computers that came with XP not having an issue with ZA.
P.S. I too wouldn't trust any security measure developed by M$. I'm guessing by the end of the year, every cracker will have cracked the built-in firewall.
