iPod Deathclock Calculator
While it's a marketing tool for a company that sells replacement iPod batteries, the "iPod Deathclock" is an amusing way to guesstimate how much life your current iPod has left. They even try to factor in the number of times you've dropped it, your daily use patterns, etc., although with any of the Flash-based models, the only real factor would be the battery. By plugging in your serial number, though, they can tell you exactly when your iPod was manufactured, which is sort of interesting.
Of course if you really wanted to zazz things up, you could put Dethklok on your iPod.
iPod Death Clock [iPodMechanic.com via Lifehacker]

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Their battery life estimate is crap. Using their sample iPod video serial number, it says that it has an estimated 25% of battery life left. An iPod photo? 10%. Riight…
Yeah, I have a 2nd gen that still has usable battery life, on the original battery. Not as good as original, but usable still. Not 10% - hell, significantly better than 25%.
DETHKLOK DETHKLOK DETHKLOK!!!