Although Git have been out their for while now, and it has become the de facto standard source control solution, I still think and can use extra advocating. Specially for all those developers that are still not using it (shame on them).
According to Wikipedia:
Git is a distributed revision control system with an emphasis on speed, data integrity, and support for distributed, non-linear workflows. Git was initially designed and developed by Linus Torvalds for Linux kernel development in 2005, and has since become one of the most widely adopted version control systems for software development.
To understand the strength of Git, you have to understand its internals. Those are explained brilliantly by Michael Schwern, in the following video. It will take 1:39, but every minute is well spend! (Thanks to Kraker for mentioning)
If you think you’re ready to get started, you should give GitHub a try. You can find me there: github.com/Corniel.