Mainly bugfix. The new version can be downloaded here: Click on me!
GNOME 2.22 Release Notes
GNOME 2.22 is the latest version of the GNOME Desktop: a popular, multi-platform desktop environment for your computer. GNOME’s focus is ease of use, stability, and first class internationalization and accessibility support. GNOME is Free and Open Source Software and provides all of the common tools computer users expect of a modern computing environment, such as email, groupware, web browsing, file management, multimedia, and games. Furthermore, GNOME provides a flexible and powerful platform for software developers, both on the desktop and in mobile applications.
The GNOME Desktop is released every six months and contains many new features, improvements, bug fixes, and translations. GNOME 2.22 continues this tradition. To learn more about GNOME and the qualities that distinguish it from other computer desktop environments (such as usability, accessibility, internationalization, and freedom) visit the About GNOME page on our website.
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GNOME 2.22 includes all of the improvements made in GNOME 2.20 and earlier. You can learn more about the changes that happened in GNOME 2.20 from its release notes.