This post covers some of the extensibility improvements made in Visual Studio 2010 – as well as a cool new “PowerCommands for Visual Studio 2010” extension that Microsoft released and which can be downloaded and used for free. “Extensibility in VS 2010 provides a much richer extensibility model than previous releases. Anyone can build extensions that add, customize, and light-up VS 2010 IDE, Code Editors, Project System and associated Designers. VS 2010 Extensions can be created using new MEF (Managed Extensibility Framework) which’s built-into .NET 4. Developers building extensions can distribute them on their own (via their own web-sites or by selling them). VS2010 also now includes a built-in “Extension Manager” within IDE that makes it much easier for developers to find, download, and enable extensions online. You can launch “Extension Manager” by selecting Tools->Extension Manager menu option. This loads an “Extension Manager” dialog which accesses an “online gallery” at Microsoft, and then populates a list of available extensions that you can optionally download and enable within your copy of VS. There’re already hundreds of cool extensions populated within online gallery. You can browse them by category (use the tree-view on the top-left to filter them). Clicking “download” on any of the extensions will download, install, and enable it,” writes Scott Guthrie.