Suggestions on a Web App firewall?

[mick at pauldotcom.com (Michael Douglas)]

It's been over three years since I've been hands on any firewalls that
have web app capabilities... so I'm going to open this up to folks
like you.  Yes you.  You seem very nice and trust-able.

Do you have any suggestions on web application firewalls?
Specifically, I'm looking for something appliance based and (sorry to
use this term) enterprise-y (specifically, as in nice centralized
management for multiple nodes, etc).

What are some products I should review?  If you provide a name, please
let me know what you like about it.  Are there ones I should avoid?



Thanks for your help!
- Mick

PS: please don't mention host based software options like mod_security
(for apache) or eEye's whatchamacallit for IIS.  We have host based
solutions already.  We want/need inline network devices in this
instance...  I don't care what GDead (Bruce from Shmoo Group) said...
I still think security-in-depth is a worthy goal.   ;-)