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I've heard the water treatment as shown in the video on a previous page can help clean off carbon, but I don't know of anything that will PERMANENTLY improve your compression short of actual mechanical work on the engine.
One trick I used once when attempting to *slightly* improve compression was to install a thinner head gasket. We were unable to do before & after tests, since we changed heads too, though.
One of my cars had no compression at all in 2 cylinders, so the head is in the machine shop for a valve job at the moment. I wouldn't have done that if the compression was only slightly low, though - until it was time to do the whole engine (when it got worse).
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