On Thu, 2007-03-29 at 09:41 -0500, Gabriel M. Elder wrote:
Specifically, the systray referred to here is the "notification area" panel applet ...[snip]... I'm not sure offhand which program is actually responsible for putting this icon in the notification area, but it is enabled by default.
It's eggcups, and it only shows up after something gets sent to the queue. Tough luck if you've just logged into a Gnome session and want to adjust the queue from a prior session. :-(