WARNING:
Only use these data files IF YOU HAVE AN EMPTY (or no) WALLET. 
While it "may" be fine to put these in with an existing wallet, and
use the -rescan option, the target audience here is new bitcoin installs 
with an empty wallet. 

Who needs this?

- Any first-time user of bitcoin, who wishes to avoid the lengthy block chain download through the p2p network.

Instructions:

- Unzip and copy blk*.dat files into your bitcoin data directory
- Remove any database/log* files from your bitcoin data directory
- Run bitcoin or bitcoind What this does:
- Resets the bitcoin block database and block database index to the state it was in at the time the snapshot was taken.
- If you have a wallet with unprocessed transactions, the client may not recognize them. Thus, the above warning: Only use these data files IF YOU DO NOT ALREADY HAVE A WALLET.


Source: http://sourceforge.net/projects/bitcoin/files/Bitcoin/blockchain/

Created by Transmission/2.42 (13013) on 11 Jan 2014