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The ASP.NET MVC controller action methods are primarily used for handling 'business' operations but it can be used for lots more. I thought it would be fun to see what creative, useful things people have created actions for that may be practical or useful for others. Here's my contribution : Javascript file concatenator - to reduce number of http requests: [OutputCache(Duration = 5 * 60, VaryByParam="")] // DONT USE "None" here * public ContentResult RenderJavascript(){ StringBuilder js = new StringBuilder(); StringWriter sw = new StringWriter(js); // load all my javascript files js.AppendLine(File.ReadAllText(Request.MapPath("~/Scripts/jquery.hoverIntent.minified.js"))); js.AppendLine(File.ReadAllText(Request.MapPath("~/Scripts/jquery.corner.js"))); js.AppendLine(File.ReadAllText(Request.MapPath("~/Scripts/rollingrazor.js"))); return new ContentResult() { Content = js.ToString(), ContentType = "application/x-javascript" }; } Map a route to it : // javascript routes.MapRoute( "js-route", "dynamic/js", new { controller = "Application", action = "RenderJavascript" } ); Refer to it from your master page : <script type="text/javascript" src="/dynamic/js"></script> Be warned I've set a cache for the output, so if you're changing your JS and refreshing the page you might want to disable the cache! I jsut need to come back and figure out how to gzip it. * You shouldn't use VaryByParam="None" because that causes the Vary header to be send, which causes the browser to g

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