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I made a tool for this : http://css-sprit.es

Thats pretty awesome, I will check it out.

I'm using auto_sprite (Rails) in my current project. Works pretty well.

No tools that I can recommend. Sigh I recommend sprites(I use them all the time) but I have been doing them so long directly in Photoshop that's my default action, especially when in a hurry. I have tried a few tools but found they are very inaccurate.