There is a great little article in Slashdot about a well known German hacker group, Chaos Computer Club, publishing the fingerprints of German Secretary of the Interior as part of their protest against state use of biometric ID.
The club published 4,000 copies of their magazine Die Datenschleuder including a plastic foil reproducing the minister’s fingerprint – ready to glue to someone else’s finger to provide a false biometric reading. The CCC has a page on their site detailing how to make such a fake fingerprint
Sweet. I suppose that is a ‘hardware hack’ of sorts!