Basic Project System Walkthrough not working on VS2010

Hello,

I have been working through the walkthrough to create a Basic Project System found here:

http://msdn.microsoft.com/en-us/library/vstudio/cc512961.aspx

I am working on Win7 with VS2010 Ultimate

Everything has  gone well until the section Initializing the Project Factory. At step 8 of this section it states to add some references. The following code changes in steps 9 and 10 then cause problems since VS indicates that it can'd find ProjectPackage, ProjectFactory or ProjectNode.

The current references are:

EnvDTE
EnvDTE100
EnvDTE80
EnvDTE90
Microsoft.Build
Microsoft.Build.Framework
Microsoft.Build.Utilities.v4.0
Microsoft.CSharp
Microsoft.VisualStudio.CommandBars
Microsoft.VisualSutio.CommonIDE
Microsoft.VisualStudio.Designer.Interfaces
Microsoft.VisualStudio.OLE.Interop
Microsoft.VisualStudio.Package.LanguageService.10.0
Microsoft.VisualStudio.ProjectAggregator
Microsoft.VisualStudio.Shell.10.0
Microsoft.VisualStudio.Shell.Design
Microsoft.VisualStudio.Shell.Immutable.10.0
Microsoft.VisualStudio.Shell.Interop
Microsoft.VisualStudio.Shell.Interop.10.0
Microsoft.VisualStudio.Shell.Interop.8.0
Microsoft.VisualStudio.Shell.Interop.9.0
Microsoft.VisualStudio.TextManager.Interop
Microsoft.VisualStudio.VSHelp
stdole
System
System.Core
System.Data
System.Design
System.Drawing
System.Windows.Forms
System.Xml
VsLangProj
VSLangProj80
WindowsBase

Does anyone have advice as to which reference is needed to include the types ProjectPackage, ProjectFactory, ProjectNode?

If the Walkthrough is out of date could it be updated so future users don't get stuck on the same issue?