Nick Hodge has recently set up a new peer-to-peer forum with Blogs, Forums and File areas for Excel users.
For more information and member registration please see: Excel User Group
What makes it attractive is that it has an Add-ins subforum:
VSTO/COM/XLL Add-Ins
This subforum will discuss and also be a Q&A forum for: COM Add-ins created with VSTO (and also about workbook level [...] Read More...