Anything new here?
I too am behind a router at home (but like having both belt and suspenders

) and also want a firewall when at public wifi hotspots or glomming onto someone's network.
I've been playing with the Comodo Firewall
http://www.comodo.com/ It gets very good reviews.
I finally dumped Zone Alarm because it basically stopped working.
Or is Windows XP's built-in firewall enough when out in public?