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I'd start with Wikipedia. Read the short article, then work through a number of the referenced articles in the bottom. ethereum.org also has information. However, their blog can be a bit thick. In short, Ethereum is a blockchain-secured decentralized global computer. It has little power, but can enable fancy transactions and contracts. Ether (ETH) is the token that secures it, and it must also be spent to execute code on the network.