The IntelliSense XML files for VSTO 2003 and VS 2005 are available for download from here -- they'll add summary descriptions of types, members, and parameters to IntelliSense ToolTips in code and in the Object Browser for Microsoft Office Word 2003, Microsoft Office Excel 2003, Microsoft Office Outlook 2003, and Microsoft Office 2003 Shared PIAs in Microsoft Visual Studio .NET 2003 and Visual Studio 2005.