“After only 2 years since the previous version, now emacs 23 .1 is available. It brings many new features, of which the support for anti-aliased fonts on X may be the most visible. Also, there is support for starting emacs in the background, so you can pop up new emacs windows in the blink of an eye. There are many other bigger and smaller improvements, including support for D-Bus, Xembed, and viewing PDFs inside emacs. And not to forget, M-x butterfly. You can get emacs 23 from ftp.gnu.org/gnu/emacs/ or one of its mirrors; alternatively, there are binary packages available, for example from Ubuntu PPA.”
For the young readers, emacs is the oldest Open Source project out of there. And it has a lot to teach to the other integrated developement environments!
At Gioorgi.com we have tried Emacs23 on a Ubuntu distribution version 9. We have compiled the big tarball with gtk support. We have tried the new daemon mode: nice stuff, but this functionality was already easy to set up with the server emacs lisp function.
We are still evaluting the font anti aliasing and the new modes, anyway Emacs spot a better GNUStep Integration, which result also in a nicer MacOSX integration (because of Cocoa/ObjectiveC bindings).