ModSecurity released for IIS
It was just announced on Microsoft Technet that a ModSecurity extension is now available for IIS. While this is still in Release Candidate status, a stable release is expected soon. There are standard MSI installers for IIS 7 and later versions on Source Forge. For the full write-up please visit the Microsoft Research site here: http://blogs.technet.com/b/srd/archive/2012/07/26/announcing-the-availability-of-modsecurity-extension-for-iis.aspx
ModSecurity is an open source web application firewall that can be implemented to help provide protection for your web applications. It has long been available on other platforms, such as apache, and is finally available for IIS. You can learn more about ModSecurity here: http://www.modsecurity.org/
I have a feeling a lot more info is going to be coming in regards to using ModSecurity with IIS.