Clock!

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Windows XP provides a basic, digital clock in the taskbar (which you can extend using TClockEx featured on this website), but a if you prefer a large analogue clock on your desktop which doubles up as a rather useful alarm which can be set to remind you once, every day or every XX minutes by showing a message, running a programme or playing a sound, then try Clock! You can even use one of 50 skins provided.

Available from http://www.gljakal.com/clock/index.php