Bitcoin 0.4.0 's main feature in this release is the addition of wallet private key encryption. It uses the http://www.aliyun.com/zixun/aggregation/33795.html ">berkeley DB 4.8 version."
Bitcoin is a point-to-point (peer-to-peer), network-based, anonymous digital currency. Point to Point (peer-to-peer) means a remittance channel without central authority to control the currency. Instead, these money transfer tasks are managed collectively by network nodes. Anonymity means that parties to a transaction can hide their true identity. Advantages: No trust intermediary, can facilitate the Internet remittance. Third parties may not be able to control or prevent your transaction. Avoid the central Reserve Bank's bad policy and instability caused by security risks. The Bitcoin system's limited currency inflation is evenly distributed (determined by the CPU) across the network, rather than by a bank monopoly. Bitcoin is an Open-source project produced by Satoshi Nakamoto, which is located in SourceForge.
Download Address: http://sourceforge.net/projects/bitcoin/files/Bitcoin/bitcoin-0.4.0/