If you are encountering issues with the installer for ASP.NET MVC 3 Tools Update, try these suggestions:

1. Wait. This install really takes a long time.
2. Make sure you exit out of VS.
3. If you are running in a virtual machine, it might not work :( because of #wp7 related parts in the installer. If you are using Parallels with Boot Camp, like I tell everyone to do, reboot in Windows, run the install and then switch back to Windows in Parallels.

There appears to be a bug in how Visual Studio does "Add Service Reference" proxy generation for VB.NET projects.

I ran into this issue when trying to add a service reference to Bing Maps and I believe it is not limited to that. I think it stems from it misunderstanding that enum instance variables cannot be tested for equality using .Equals in VB... not sure why.

I think the solution is to simply replace the offending line:

If Me.enumfield.Equals(value) <> true Then

with

If Not Object.Equals(Me.enumfield ,Value) Then

BTW: DO NOT compare boolean results to True or False as they have done!

Use

If boolean_results Then

or

If Not boolean_results Then

[EDIT 2010-07-07]
Specifically, this block of code is wrong:

<System.Runtime.Serialization.DataMemberAttribute()>  _
Public Property CompareOperator() As SearchService.CompareOperator
    Get
        Return Me.CompareOperatorField
    End Get
    Set
        If (Me.CompareOperatorField.Equals(value) <> true) Then
            Me.CompareOperatorField = value
            Me.RaisePropertyChanged("CompareOperator")
        End If
    End Set
End Property

and should be replaced with this:

<System.Runtime.Serialization.DataMemberAttribute()>  _
Public Property CompareOperator() As SearchService.CompareOperator
    Get
        Return Me.CompareOperatorField
    End Get
    Set
        If Not Object.Equals(Me.CompareOperatorField,value) Then
            Me.CompareOperatorField = value
            Me.RaisePropertyChanged("CompareOperator")
        End If
    End Set
End Property

Made this edit so search engines would pick it up... so I can find my own fix next time I run into it. :) [/EDIT]

[EDIT 2011-09-17]
It is still broken in VS2010 and will break your fixed project when upgrading. Gosh, thanks.
[/EDIT]

Got the BlackBerry VS9 Plugin running in Visual Studio 2008 running in Windows 7 x64.
Not sure what of these steps are really necessary, but this is what I did:

Copied "Research In Motion" directory from "Program Files (x86)" to "Program Files". This gave me a different error.

Discovered using SysInternal's ProcMon that it was trying to launch RIM.Net.Tools.ScriptHost.exe from the root, so I copied that and all the other stuff in the plugin's bin folder to the root, yes, C:\.

That gave me another error, so then I set VS2008 to run in XP SP3 compatibility mode.

Tada!