Ethereum blockchain download
You may download Mainnet Ethereum blockchain as of 2016-05-30, including 1,613,031 blocks (1.7GB) from here:
Use it as a bootstrap this way:
Ethereum client will validate this data you have downloaded as correct for the Ethereum network mainnet. This way you save 1 or 2 weeks of data sync.
You may also download Testnet Ethereum blockchain as of 2016-06-04 (873MB) from here (thx to Karol Sokolowski):
and install in a similar way.
Ethereum is a public blockchain platform with programmable transaction functionality. It provides a decentralized virtual machine that can execute peer-to-peer Turing-complete smart contracts using a cryptocurrency called Ether (ETH).
Ethereum was initially proposed by Vitalik Buterin in late 2013 and in 2014 he described it as "A Next-Generation Cryptocurrency and Decentralized Application Platform". Development was funded by a crowd sale in August 2014.
According to Coinbase Co-Founder: Ethereum Could "Blow Past" Bitcoin. All the cool kids are doing Ethereum now.
You may find more details about import/export Ethereum blockchain at ethereum.stackexchange.com.