Visual Studio 2010 provides excellent support for extensibility via the Extension Manager -- a new component in Visual Studio 2010 IDE that lets you add, remove, enable/disable Visual Studio extensions.

The Extension Manager UI is similar to the Windows Control Panel UI. You can know more on how best to provide extensibility features to Visual Studio 2010 by going here.

The Extension Manager is available in the Tools menu bar in Visual Studio 2010. When you click on the Extension Manager from the Tools menu bar in the Visual Studio 2010 IDE, the Extension Manager dialog box opens. You then see a list of the available extensions populated in the Extension Manager dialog box from where you can select the extension you would like to use. You can also install and use third-party templates by clicking the Search Online Templates option in the Templates pane of the New Project dialog box in the Visual Studio 2010 IDE.

PowerCommands for Visual Studio 2010 is one such newly available extension that you can install using the Extension Manager in Visual Studio 2010.

Though extensions are great in providing extensibility to the Visual Studio 2010 IDE, you might sometimes need to disable them. The reason is that there can be a bug in an extension that might impact the performance of the Visual Studio 2010 IDE as a whole. To disable extensions from within the Visual STudio 2010 IDE, select the Extension Manager option from the Tools menu bar to invoke the Extension Manager dialog box. Next, select "Installed Extensions" and click "Disable" next to the installed extension you would like to disable.