Use PowerShell for Visual Studio Command Prompt
You can use for example this script to import Visual Studio command prompt environment, see the examples in the script documentation comments, e.g. for Visual Studio 2010:
Invoke-Environment '"%VS100COMNTOOLS%\vsvars32.bat"' Having done that in the beginning of a PowerShell session (from your profile or manually), you get what you ask for in this PowerShell session.
Or you can use the solution provided by Keith Hill in this answer.
PowerConsole has been incorporated into NuGet http://nuget.codeplex.com/. You get PowerShell inside Visual Studio and a package management system.