AFAIK, you can create add-ins with any edition, provided that you have the
required assemblies (EnvDTE.dll, EnvDTE80.dll, VSLangProj.dll, stdole.dll,
etc.), since an add-in is a DLL. Another thing is that maybe the add-in
wizard is missing in some editions, but you don´t need it to create the
code.
About loading add-ins, I think that the Express editions don´t allow it but
everything else does.

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Best regards,
Carlos J. Quintero
MZ-Tools: Productivity add-ins for Visual Studio .NET, VB6, VB5 and VBA
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> Hi all,
>
[quoted text clipped - 5 lines]
> Gerrit Beuze
> ModelMaker Tools
Gerrit Beuze - 18 Nov 2005 11:09 GMT
Hello Carlos,
> AFAIK, you can create add-ins with any edition, provided that you have the
> required assemblies (EnvDTE.dll, EnvDTE80.dll, VSLangProj.dll, stdole.dll,
> etc.), since an add-in is a DLL.
Obviously: but let me rephrase the question then:
does Standard edition ship with the EnvDTE.dll etc. assembies?
> About loading add-ins, I think that the Express editions don´t allow it but
> everything else does.
I asked because
http://lab.msdn.microsoft.com/vs2005/productinfo/productline/default.aspx
says in topic "Extensibility" for Standard: "consume extensions" iso "all"
Gerrit Beuze
ModelMaker Tools