I am pleased to announce the release of the Visual Studio 2005 Tools for Applications Software Development Kit (SDK). VSTA allows Independent Software Vendors (ISV) and enterprises to add application customization to their applications. Microsoft InfoPath 2007 has integrated VSTA. You can see VSTA in action by designing an InfoPath form and pressing Alt-Shift-F12 to launch the VSTA development environment. Think of VSTA as the managed alternative to VBA. VSTA and VBA can also run side by side within the same application so your users can create customizations in the language that makes sense for them.
Get started today by downloading the VSTA SDK and going through the walkthrough that takes you step by step through the integration of VSTA into a sample application called ShapeApp.
Be sure to visit the VSTA Developer Center for more details.