Bitcoin is an experimental new digital currency that enables instant payments to anyone, anywhere in the world. Bitcoin uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network. Bitcoin is also the name of the open source software which enables the use of this currency.
The software is a community-driven open source project, released under the MIT license.
Latest Bitcoin-Qt version: 0.6.2
(see all Bitcoin clients)
Windows (zip) ~12MB
Windows (exe) ~9MB
Ubuntu PPA
Linux (tgz, 32/64-bit) ~11MB
Mac OS X ~12MB
Press mailing list for presentation and interview requests: 
8 May 2012
Bitcoin version 0.6.2 is now available for download at: http://sourceforge.net/projects/bitcoin/files/Bitcoin/bitcoin-0.6.2/
This is a bug-fix release with no major new features.
Please report bugs using the issue tracker at github: https://github.com/bitcoin/bitcoin/issues