The add-in wizard, in case that standard edition has it (which I am not
sure), should be in the Other Projects, Extensibility Projects node of the
Project Types treeview of the New Project dialog.

If the standard edition doesn?t have it, you can still build add-ins since
the wizard is just a code generator. Basically an add-in is a Class Library
project with some references to Extensibility.dll, EnvDTE.dll, etc. and a
class which implements the interface Extensibility.IDTExtensibility2.

I would recommend you the book "Inside Microsoft Visual Studio .NET",
Microsoft Press, by Craig Skibo and others, whose chapter 6 "Add-In
Architecture" is exactly about how to write an add-in without the add-in
wizard. And in any case it is a must have book about developing add-ins for
VS.NET...

You can get also a lot of resources (docs, samples, articles, knowledge
base, books, etc.) about add-ins in the Yahoo forum below (free join),
specially in the Files section:

http://groups.yahoo.com/group/vsnetaddin/

My web site (below too) has also a list of MSDN Knowledge Base Community
Articles that I have written about bugs, problems and howtos that you can
find interesting.

Best regards.