JSCalendar is a great DHTML calendar widget by Mihai Bazon of Dynarch.com. It manages to pack in a wealth of features yet still be intuitive to the average user.
Unfortunately I can't tell the same about the available skins. I wanted a skin that was a little more up-to-date for a project I've been working on, so after a few hours here's my first theme, the JSCalendar white theme.
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