MSBuild + YahooCompressor

gistfile1.txt

<?xml version="1.0" encoding="utf-8"?>
<Project xmlns="http://schemas.microsoft.com/developer/MsBuild/2003">
  <UsingTask
      TaskName="CompressorTask" 
      AssemblyFile="\MSBuild\Yahoo.Yui.Compressor.dll" />

  <Target Name="MyTaskTarget">
    <ItemGroup>
       <CssFiles Include="\Content\css\**\*.css"  Exclude="\Content\css\**\*min.css"  />
      <JavaScriptFiles Include="\Scripts\**\*.js"  Exclude="\Scripts\**\*min.js" />
    </ItemGroup>
    <CompressorTask
          CssFiles="%(CssFiles.Identity)"
        DeleteCssFiles="False"
        CssOutputFile="%(CssFiles.RelativeDir)%(CssFiles.Filename).min.css"
        CssCompressionType="YuiStockCompression"
        JavaScriptFiles="%(JavaScriptFiles.Identity)"
        ObfuscateJavaScript="True"
        PreserveAllSemicolons="False"
        DisableOptimizations="Nope"
        EncodingType="Default"
        DeleteJavaScriptFiles="False"
        LineBreakPosition="-1"
        JavaScriptOutputFile="%(JavaScriptFiles.RelativeDir)%(JavaScriptFiles.Filename).min.js"
        LoggingType="ALittleBit"
        ThreadCulture="en-US"
        IsEvalIgnored="False"
            />

  </Target>
</Project>