Microsoft unveiled Windows 7 will enable you to turn various Windows features on or off, this includes the Internet Explorer 8 browser, the media features, games, Windows Search, .NET Framework and various other features. More details at MSDN.
“Turning Windows Features On or Off” has a long history in Windows, going back to the earliest days of the 32-bit code base. We’ve received a lot of suggestions about features that you would like to turn on or off using your own criteria for choice. For Windows 7 we’ve engineered a more significant list of features and worked to balance that list in light of the needs of the broad Windows platform as well. We want to provide choice while also making sure we do not compromise on compatibility by removing APIs provided for developers. We also want to strike the right balance for consumers in providing choice and balancing compatibility with applications and providing a consistent Windows experience.
Here's a look at the Windows Features control panel which will make its debut in Windows 7 RC1: