TortoiseSVN is a really easy to use Revision control / version control / source control application for Windows. It is based on Subversion. TortoiseSVN provides a nice and easy user interface for Subversion.
What's new in this version:
Version 1.7 includes working copy metadata storage improvements, x64 Installer, property dialogs, Windows 7 Library, repository browser, sparse checkouts, and compatibility concerns.