A number of add-ins have been written for .NET Reflector to extend its functionality. Most of these add-ins are open-source, and are available via the Codeplex website.

To view the current add-ins, on the View menu, click Add-ins. The Add-ins dialog box is displayed showing you a list of the installed add-ins. You can install new add-ins and remove existing add-ins from this dialog box.

You can find information on how to install the add-ins on Simple Talk.