With the wide variety of solutions available for automating, customizing, and extending Excel, it can be hard to determine which technology to use. And even if you know which solution you want, it can be hard to find all of the related documentation you need to get the job done.
Microsoft have created the "Excel Developer Roadmap," that gives you an overview of the available Excel-related development options, and surfaces links to the applicable help content -- whether that help is on MSDN, TechNet, or Office.com. As new help articles are published, the roadmap will be updated to reflect the most current guidance.
Also updated the Excel Developer Center with Excel 2010 content, that contains links and feeds to the latest help content, blog posts, and community content.