not a real firewall but also interesting ist the tool "Windows 7 Firewall Controll"
http://www.sphinx-soft.com/Vista/order.html
You can easily configurate your Windows 7 / Firewall. There are enough "security-experts" that believe, that a second Firewall just increase the contact surface and open a lot of exploits.
P.S: sry for posting in english but I can't write in russian anymore XD