Would you be interested in further contributions to the efficiency of the frontend? I guess I could try to find a solution to maintainable CSS sprites, and CSS and Javascript minification and compression.

By the way, do some images intentionally lack a transparent background?
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(Like message.png and comment.png, one has a transparent background, the other has a white background.)
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Here is an update to latest trunk.
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As far as I know, images are directly taken from the famfam icon set, any lack of optimization or transparent background is not intentional. If you want to provide a fully optimized set, I'll integrate them all in the same commit.

Anyway, we don't want to maintain CSS sprites, it's a bit too complicated to maintain. Thanks for your contribution.
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I'm not sure if this ticket is older or then sprockets css sprites... but here we go:

http://railscasts.com/episodes/334-compass-css-sprites?view=asciicast
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