Application Firewall suggestions

I have been requested to research possible application firewall solutions for a windows server 2003 environment.  Most of the information I am finding though is from a number of years back (as such the software is no longer made), so I was wondering if anyone had any suggestions for current popular web application firewall software?
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this isn't just an application firewall but also protects against buffer overflows, SQLi, and even zero day vulns based on proper implentation of RFC compliance.  it isn't cheap at $1000 but I'm a big fan of eEye products. Very solid and reliable.


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