Chong Yidong is reporting that Emacs 24.0.90, the first Emacs 24 pretest, is available for download at ftp://alpha.gnu.org/gnu/emacs/pretest/emacs-24.0.90.tar.gz. As usual, the changes are listed in etc/NEWS.
In the comments to my post about Emacs 24 features, several of the commenters said that they were using the development version of Emacs 24 and that it was “rock solid.” Thus there’s no reason not to give this pretest a try if you’ve been waiting for any of the new features in Emacs 24. If you don’t know what those features are and want a nice summary, take a look at this post by Bozhidar Batsov.