Some links to get you started learning VSTO, provided by mike....

There are a number of resources you can tap for further information on Visual Studio 2005 Tools for the Microsoft Office System (VSTO).
http://msdn2.microsoft.com/library/d2tx7z6d(en-us,vs.80).aspx
http://msdn.microsoft.com/office/understanding/vsto/default.aspx
http://msdn.microsoft.com/smartclient/understanding/vsto/
Here are a few webcasts our team has done just recently. All MSDN webcasts are recorded, so you’ll be able to view them on demand (via the On-Demand Webcasts site) in case you miss the live presentation.
Asking Questions
You can post any questions you have about VSTO on the VSTO Forum and/or the VSTO Newsgroup. VSTO team members and VSTO MVPs monitor these sites and can answer questions as they arise. We do ask, however, that you first check the VSTO Help Documentation to determine whether there is already an answer to your question.
Please note that it’s best to post questions regarding topics that are specifically germane to Excel or Word (such as troubleshooting COM, using VBA, Excel/Word installation, etc.) on the Excel or Word newsgroups.
http://forums.microsoft.com/msdn/ShowForum.aspx?ForumID=16
http://groups-beta.google.com/group/microsoft.public.vsnet.vstools.office
Posting Bugs
You can post any bugs you may find in VSTO on the MSDN Product Feedback Center. To ensure that you’re not posting a duplicate bug, be sure to use the Search option on the main page to determine whether your bug has already been discovered and posted.
http://lab.msdn.microsoft.com/productfeedback/
Team Contacts
If you have any general questions about VSTO, please feel free to contact these team members.
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