I've upgraded to Raring a couple of days ago, and noticed that certain indicators are not appearing in my Unity panel, while all other do.
Essentially I'm referring to: pyAlienFX (from http://code.google.com/p/pyalienfx/), Thunderbird (with Firetray extension, https://github.com/foudfou/FireTray.git) and pidgin.
Obviously they all did work with previous 12.10.