If you seen my blog on Application Request Routing (ARR) v2 , you know I am a big fan of how ARR opens up new capabilities for IIS around application request routing , edge caching particularly in high definition media delivery , and Tomcat-type
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Read the complete post at http://blogs.iis.net/mailant/archive/2010/03/25/how-iis-application-request-routing-arr-powers-elastic-scale-for-maximumasp.aspx