A List Apart has an interesting overview of CSS3 animation and user experience .
I have seen a few of these effects around, and they really add to the user experience while being pretty light.
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CSS3 Animations
Tag: CSS3
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Cool CSS3 Gradient Animation Effect
An interesting way to get background gradient animation with CSS3 – basically by using a larger background image and moving the position on hover.
Check out the original article .
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More Cool CSS3 Effects
Some very nice effects with sources listed in this article .
My favorites (with direct links and images):
– black and white images (might try these for STGThumb albums)
– page top shadow (looks very nice)(broken link)
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8 cool new CSS3 effects
Very interesting post at WebDeveloperJuice showing 8 just arrived magic effects of css3 worth to know .
It is hard to choose a favorite, but the paper fold looks very nice.
Update: a few more effects on More Cool CSS3 Effects