The old axiom has held true for several thousand years. It's as if it was meant to follow "We hold these truths to be self-evident". Yet, it seems there may be doubt.
Scientists at Pittsburgh's Safar Centre for Resuscitation Research have developed a technique in which a subject's veins are drained of blood and filled with an ice-cold salt solution. 3 hours later the blood is replaced and the subject is brought back to life with an electric shock. They have only done this with dogs at this time but they expect human trials in the next few years. (No word if they will still fetch or roll over on call.)
Meanwhile, a former IRS criminal-investigation agent Joe Banister (who learned of serious constitutional questions relating to the federal income tax systems and decided to share that information with others when talking to employees of CENCAL in 2000) has won a court battle defending his actions. The IRS sued Banister for violating certain laws governing conspiracy and aiding and assisting in the filing of false tax returns.
Do either of these remove the certainty of either death or taxes? No. But, they put interesting dents in them. Sure, the dogs may be great for a George A. Romero film. Sure, Banister's case may be overturned if it goes to the Supreme Court (we have no idea what they'll do nowadays.) But, what did Bill Murray call them? Baby steps.