MSBuild Building multiple Configurations and Platforms at the same time

Here is a MSBuild project file that allows you to specify multiple configurations and platforms.  The advantage of this approach is that you get a single report with all the build results.
 
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Rebuild" ToolsVersion="4.0">
  <ItemGroup>
    <ConfigurationList Condition="  '@(ConfigurationList)' == '' and $(Configuration) != '' " Include="$(Configuration.Split(';'))" />
    <ConfigurationList Condition="  '@(ConfigurationList)' == '' " Include="Debug" />
    <PlatformList Condition="  '@(PlatformList)' == '' and $(Platform) != '' " Include="$(Platform.Split(';'))" />
    <PlatformList Condition="  '@(PlatformList)' == '' " Include="Xbox  360"  />
    <TargetList Condition="  '@(TargetList)' == '' and $(Targets) != '' " Include="$(Targets.Split(';'))" />
    <TargetList Condition="  '@(TargetList)' == '' " Include="Rebuild" />
    <ProjectList Condition="  '@(ProjectList)' == '' and $(Projects) != '' " Include="$(Projects.Split(';'))" />
    <ProjectList Condition="  '@(ProjectList)' == '' " Include="$(MSBuildProjectDirectory)\Test.sln" />
  ItemGroup>
 
  <Target Name="Rebuild" Outputs="%(PlatformList.Identity)">
    <PropertyGroup>
      <CurrentPlatform>%(PlatformList.Identity)CurrentPlatform>
    PropertyGroup>
    <MSBuild Projects="@(ProjectList)"
             Properties="Configuration=%(ConfigurationList.Identity);Platform=$(CurrentPlatform);"
             Targets="@(TargetList)"
             SkipNonexistentProjects="true"  
             />
  Target>
Project>

usage:
msbuild BuildProject.proj  /p:Projects="ProjA;ProjB" /p:Configuration="Debug;Release" /p:Platform="XBox  360;Win32;x86" /p:Targets="target"
              
examples:
 
        msbuild BuildProject.proj   
       -- this will rebuild default solution for Debug|Xbox 360

        msbuild BuildProject.proj /p:Projects="Test2.sln;Test1.sln" ^
   /p:Configuration="Debug;Release" ^
                 /p:Platform="XBox 360;Win32;x86" ^                               
   /p:Targets="clean;build"
 -- this will build everything