Bitcoin mining can be profitable, but it's best performed on a system with some solid grunt. Still, I've got a lot of admiration for this hack, which tries valiantly to mine bitcoins with a Nintendo Entertainment System.
When even the inventor admits that it's a "brilliantly useless project", it's clear he's not looking to suddenly become rich with the RetroMiner. Then again, technically speaking the mining process is random, so he could -- although it's astonishingly unlikely -- hit it rich. [RetroMiner via HackADay]