The notification area in Windows 7 is an improvement over previous versions of Windows. Problem is, after installing lots of applications and using them for a while, you end-up having a huge list icons in the notification area settings window. Even if some of them you actually uninstalled in the meantime, they still show up. Therefore, finding applications that you are actually using and making the settings you desire can take more time than it should.
The team from 7 Tutorials created a small batch-file which you can download & execute so that your notification area icon cache is reset. After you run it, Windows 7 will recreate the cache and it will include only currently used applications.