As a follow-up to this question, the very useful and small birthday (and more) reminder tool Gbirthday does not seem not work with Unity. Is there a way to tweak this, so Gbirthday works in Ubuntu with Unity?
Normally there would be a small icon in the panel, but I guess Unity does not like "foreign" items in the panel.
Best Answer
You can make any program that used to use the old notification system in Gnome 2.0 (the panel before Unity) show up in the new panel in 11.04 and 11.10 by whitelisting it. There are directions in this blog post:
http://www.webupd8.org/2011/04/how-to-re-enable-notification-area.html
If you don't like the command line, skip down to section B in the instructions (B. Using a GUI).