Well, after many months of hard work by the GNOME team, GNOME 2.20 is released and out in the wild. Ubuntu's new release (expected in just under a month) will have this, and hopefully other distros will get this new release in as well. Great work from the GNOME team... congrats!
The improvements in GNOME 2.20 include: Improved support for right-to-left languages; desktop search integrated into the file chooser dialog; convenient new features in the Evolution email and calendar client; enhanced browsing of image collections; simplified system preferences; efficient power management and incredibly accurate laptop battery monitoring. Developers receive more help with application development thanks to a new version of the GTK+ toolkit, improved tools, and a great new documentation web site.
The best new feature I see though, is this one, the mail client will warn you if you say you attached a file, and then forget to attach the file. Worth switching right then and there :)