For work I built an HTTP Optimizer: Vanishing Point. It’s a framework that accepts plugins, so that custom optimization engines can be built for different file types. Currently I have released a CSS and Javascript optimizer plugin. Both implement packers/miniifiers designed by other people, however; I added in my own code to further optimize them. They also will combine files so as to save time by reducing HTTP requests. In our benchmarks they have shown that they do infact reduce page load time.
Here is the google code SVN repo:
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