On many smartphones (Samsung Galaxy II being an example) when you browse through a photo gallery, its blurred copy is laid out in the background. Can this be achieved by CSS dynamically (ie. without the copy of the photo being prepared upfront saved)? Is there any kind of complex CSS image filter to blur an image?
You can use CSS3 filters. They are relatively easy to implement, though are only supported on webkit at the minute. Samsung Galaxy 2's browser should support though, as I think that's a webkit browser?