I was a bit surprised to NOT see this on here in the last few days. Figured it was about time to pass it along.
Guy took a 1943 board and tapped off the RAM to pull live highscores so they can be saved between power cycles and tweet to the internet at large whenever someone sets a new record on the machine.
http://hackaday.com/2011/05/27/adding-persistent-memory-and-ethernet-to-vintage-arcade-machines/
You know, in retrospect, you could probably get a similar effect for MAME by having a third party tool that analyzes state files. The only problem would be how much a given state file's internal structure might change between MAME revisions.
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Try checking the MAME manual at http://docs.mamedev.org
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Slightly modified 1943 board
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