You might start at http://www.outlookcode.com/d/comaddins.htm --
particularly with the Items Command Bar sample application.
What you're trying to do, BTW, is potentially quite complex, since you have
to work with both Word as the email editor (relatively easy) and the
built-in Outlook editor, which has no insertion point object. You will
probably need to use the SafeInspector object from the third-party
Redemption library (http://www.dimastr.com/redemption/)

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Sue Mosher, Outlook MVP
Author of
Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> I'm unfamiliar with Office addins and have been tasked with creating
> one that will allow the selection of different custom 'signatures'
> from a drop-down or maybe a form off an addin button. Can anyone
> suggest a good resource for a new addin writer?? (preferably a web
> site with examples??) Thanks in advance for your help in this
> matter....