The taskbar has been reinvented: It's amazing how little the taskbar and its system tray have changed since Windows 95. In Windows 7, they both undergo sweeping, long-overdue makeovers. For the most part, the results are extremely pleasing.

The new taskbar's default style does away with text labels and relies solely on program icons, therefore making better use of screen space. Its thumbnail previews--an improvement over Vista's--work well even when you have multiple windows open for one application. And the new Jump Lists feature gives you right-click access to context-sensitive menus of options (such as the ability to play shuffled music in Windows Media Player) even before you've launched an application. Even the nub on the right edge of the taskbar, which you can click to reveal the desktop, is a welcome, subtle enhancement. (One taskbar quibble: The border around running apps in the taskbar isn't a clear enough cue to distinguish between them and those that aren't currently active.)

The system tray--which is officially called the notification area, although I don't know anybody who calls it that--is no longer one of Windows' most aggravating "features." When you install new applications, any associated system-tray applets are cordoned off in a holding pen, where they can't clutter up the tray and can't use word balloons to pester you with information that you may or may not care about. You can also choose to have an applet appear in the system tray but in bound-and-gagged form, so it can't pop up messages. Microsoft has also dramatically reduced the volume of distracting messages from Windows itself, courtesy of Action Center, which queues up system alerts so that you can check them out at your convenience.

UAC is now tolerable: Windows Vista introduced User Account Control, which tries to warn you of attempts by viruses and other malware to tamper with your system. But it essentially has two settings: So Annoying You Click Without Thinking, and Off. In Windows 7, you get two intermediate settings that alert you only if a program changes settings, with or without the melodramatic screen-dimming effect. This new version is such a reasonable approach that it's even more mysterious how Microsoft could have botched the Vista version so badly.

Libraries collect your files: For years, Microsoft has tried to train Windows users to store all of their personal files in one place, helpfully providing a folder named My Documents for that purpose. Many of us blithely ignore the suggestion and store stuff willy-nilly around our hard drives. A new feature called Libraries splits the difference by giving you virtual folders for documents, music, photos, and videos that combine the contents of whichever folders you specify into one unified view. The Pictures Library, for instance, can show all your photos even if they're stored in a dozen different places. Still, there's room for improvement--Libraries would be even more useful if they were integrated with the existing Saved Searches feature, which creates another, separate form of virtualized folder.