Question : What is the best layer 7 filtering firewall?

What is the best layer 7 filtering firewall?

Answer : What is the best layer 7 filtering firewall?

I have had good luck with http://www.barracudanetworks.com/ns/products/spam_overview.php

But check out page 13 of this doc:
http://www.sans.org/reading_room/whitepapers/application/application-firewalls-forget-about-layer-7_1632