Instead of manually dragging all your new photos, videos and music onto your Windows Media Player library, just use the "media information changes button" in the library tab. That way the application will automatically browse your PC for new content and add what it finds into your library. If you add new stuff constantly, make sure you do this regularly to keep your media collection up to date. Check out our screencast:

[googlevideo]8414783378667319480[/googlevideo]

It's simple and only takes a few seconds. If you have the new version of Windows Media Player (version 11) installed, try it out.