I am currently looking into GIT, I have previously used CVS and our current repository of choice is Subversion.  view a Comparison against Subversion.

Git is…

Git is an open source, distributed version control system designed to handle everything from small to very large projects with speed and efficiency.

Every Git clone is a full-fledged repository with complete history and full revision tracking capabilities, not dependent on network access or a central server. Branching and merging are fast and easy to do.

Its highlights include:

• Distributed development.
• Strong support for non-linear development.
• Efficient handling of large projects.
• Cryptographic authentication of history.
• Toolkit design.