TheAeroClock is a freeware desktop clock application that's light on system resources, portable and well-designed.
Here are some screenshots to illustrate the features and user interface of this application:
Analog clock for desktop to show you what the time is, providing various customization options, such as adjusting transparency. Screenshot of TheAeroClock - 1082px · 1137pxSimple clock with transparency. Screenshot of TheAeroClock - 1082px · 1137pxDesktop clock with alpha transparency. Screenshot of TheAeroClock - 1082px · 1137px"The Aero Clock", the desktop clock with alpha transparency. Screenshot of TheAeroClock - 1457px · 1551pxTheAeroClock: User interface. Screenshot of TheAeroClock - 1458px · 802px