If you are new to Subversion, try these resources.

Subversion for Designers
A walk-through for those who want to know the basics to Subversion and version control.

A Visual Guide to Version Control
This article clearly explains version control in a visual way. We highly recommend this article if you are new to version control and Subversion.

Version Control with Subversion
A free online book. This is the only resource you will need to learn all things about Subversion, including best practices when working with a team. We recommend skipping to the Basic Work Cycle chapter.

Subversion Cheat Sheet
A PDF Subversion command cheat sheet. Great resource to print out as you start using Subversion for the first time (thanks to Ariejan de Vroom).