"Customization isn't the whole story in KDE 4.2, of
course. Developers may appreciate the new support for writing
desktop widgets in Ruby and Python. Average users can find all
sorts of enhancements in individual applications, from the ability
to open tabs in the Dolphin file-manager to the ability to use Vi
keybindings in the Kate editor, and the addition of PowerDevil for
power management, especially on laptops.
"All users, too, can appreciate the wealth of new applets, such
as the Blue Marble Globe or RRSNow. There is even Bball, a red
bouncing ball for the desktop that fulfills the apparent obligation
for GNU/Linux desktops to have at least one useless widget.
"But even these changes -- which easily run into the hundreds,
if not thousands -- are usually aimed at letting users work in
their own way. And nowhere is this tendency more obvious than in
the general desktop options. Although usability began to creep back
in with the 4.1 release last summer, with 4.2, concern with
usability has become the dominant theme, with new configuration
options to FolderView, Krunner, and the various sections of the
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