Just downloaded Comodo 3 to give it a go after reading some firewall reviews:
http://www.matousec.com/projects/win...is/results.php
As good as Zone Alarm Pro and right up there with Kaspersky FW and the only firewall to pass all known leak tests. Not bad for free!
Comodo 3 has moved up and solved the few bugs from the last version I used. However, there is still a steep learning curve with this FW but it has it's own forum site. It's companion, the Comodo Anti-Virus has a built in e-mail scanner and is simplicity itself to use.