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Here are more online resources:
ASP.NET Caching at http://msdn.microsoft.com/en-us/library/xsbfdd8c.aspx
ASP.NET Caching: Techniques and Best Practices at http://msdn.microsoft.com/en-us/library/aa478965.aspx
Top 10 Performance Improvements in IIS 7.0 at http://technet.microsoft.com/en-us/magazine/2008.09.iis.aspx#id0110054
The "Reluctant Cache" Pattern at http://weblogs.asp.net/gavinjoyce/pages/The-Reluctant-Cache-Pattern.aspx
HTTP 1/1 definition, section 14 Header Field Definitions at http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
ASP.NET Routing… Goodbye URL rewriting? at http://chriscavanagh.wordpress.com/2008/03/11/aspnet-routing-goodbye-url-rewriting/
Configuring Output Caching in IIS 7 at http://technet.microsoft.com/en-us/library/cc732475(WS.10).aspx
Extensible Output Caching with ASP.NET 4 (VS 2010 and .NET 4.0 Series) at http://weblogs.asp.net/scottgu/archive/2010/01/27/extensible-output-caching-with-asp-net-4-vs-2010-and-net-4-0-series.aspx
OutputCacheProvider...