Regardless the end of GSoC 2007 I continued my work on Deskbar-Applet.
Today, version 2.19.91 has been released. It features numerous bug fixes. Including fixes that make navigation behave similar to Deskbar < 2.19. In addition, you can now click on the '>' on the right of matches with more than one action to switch to the list of actions. This replaces that you have to press Ctrl when clicking on a match to switch to the list of actions. To get back to the list of matches you can now click the new “Back to Matches” button. Also notable is that the GUI will be displayed in the center of the screen at all time.
If you want to write your own module you can make use of the new ActionFactory that returns a list of actions depending on a file's MIME-type. Check out Writing new-style modules for Deskbar-Applet.
All in all, I think this release should make using Deskbar-Applet a little bit more comfortable.
You can download it at http://ftp.gnome.org/pub/GNOME/sources/deskbar-applet/2.19/
According to bugzilla many people have problems like in #470842 or #470850. This is caused when restoring items from history. Some classes changed since the last version and can't be restored. Just delete your history file (~/.gnome2/deskbar-applet/history_new.pickle) and you should be fine again.