I was searching this morning for an option or plugin that would allow Evolution to be minimized to the tray. I want to keep it open & get notifications of email, but don’t want to clutter up my panel.
In my search I found a small sourceforge project called “AllTray“.
With AllTray you can dock any application with no native tray icon (like Evolution, Thunderbird, Terminals) into the system tray. A high-light feature is that a click on the "close" button will minimize back to system tray. It works well with Gnome, KDE, XFCE 4*, Fluxbox* and WindowMaker*
I could find this useful for many of the common apps that I use. I think it can still use a little work, but it is still very useable. Go ahead, check it out. (repos for Ubuntu, Debian SID & SuSE)