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For developers transitioning from a Centralized Version Control System (CVCS) such as SVN to a Distributed Version Control System (DVCS) such as Git, the Pro Git book can be useful. A free version of the book can be read on-line or downloaded.
Another good resource is Think Like A Git, a site who's main page states "Git shouldn't be so hard to learn."
Git and Eclipse
The latest version of Eclipse (indigo) comes with a URL for installing EGit. The EGit eclipse plugin provides eclipse with git support. A good place to start is the User's guild: http://wiki.eclipse.org/EGit/User_Guide.
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