Moonrise Icon
Moonrise Icon puts an icon showing the current moon phase in the "tray" area of the taskbar.. One click of the icon launches the main Moonrise program. Holding the mouse pointer over the icon shows a "ToolTip". You can configure Moonrise Icon to show you:
The first time you run Moonrise Icon, it will pick up your latitude and longitude settings from Moonrise. Time zone and daylight time settings are picked up from your computer's settings. Right clicking the icon will bring up a menu of options. Check the Launch at Startup option in the Configure dialog if you want to run it all the time.
Moonrise Icon is available for free to registered Moonrise users. Get it from the download page.