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Update: Emacs22 is now available via apt. Before trying this try sudo apt-get install emacs22. You will still need to edit your .emacs file as instructed in the last paragraph to handle Java annotations.

Emacs 22 is now released. I have installed on my Ubuntu Feisty Fawn system. The package is not yet available on the apt repositories, so this required building from source. Here are the steps I followed:

Install prerequisites as follows:
sudo apt-get install g++
sudo apt-get install libgtk2.0-dev

Download the source from http://ftp.gnu.org/pub/gnu/emacs/emacs-22.1.tar.gz.

After unpacking, run:
./configure --with-gtk --enable-font-backend --with-xft --with-freetype
make
sudo make install

Voila! The executable is now installed at: /usr/local/bin/emacs-22.1

The java-mode still does not handle annotations correctly. Getting around this requires adding the following to the ~/.emacs file. It simply treats annotations as comments:

(add-hook
 'java-mode-hook
 '(lambda () "Treat Java 1.5 @-style annotations as comments."
    (setq c-comment-start-regexp "(@|/(/|[*][*]?))")
    (modify-syntax-entry ?@ "< b" java-mode-syntax-table)))

My notebook dual boots Ubuntu and Windows.  Sharing files between the two systems has historically been an issue.

I just upgraded to version 7.04 - Feisty Fawn.  While opening a file in The Gimp, I noticed an extra hard drive listed in the dialog.  It was my Windows NTFS partition.  Sweet!  The file system mounts read only by default, but write support can be enabled.  More information can be found here.