To refresh a widget in the Dashboard, open the Dashboard, select a widget, and press Command-R. There is a slick little animation, and the widget will refresh.
[crarko adds: I've seen this before, but on searching didn't find it here as a hint. Here is a previous hint with a list of other interesting modifier keys. It looks like the wiki mentioned there is no longer active, so I'll see about creating a new one. Thanks to reader Reuven Volnoboy for pointing this out.]
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Mac OS X Hints
http://hints.macworld.com/article.php?story=20100721201927434