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Interesting idea. I already do the "whitespace" minimization on my CSS and javascript files and I tend to only ever use 1 of each instead of multiples...
The image thing is sort of cool... they've cut down from 7 connection and download requests to just the 1.. plus there's probably a bit of a size reduction as instead of having 7 image file headers there will be just 1. But before implementing it should be well thought out as you'll lose out on any SEO benifits from the alt tags of the images.
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