SSH without password using Putty

Those to links are useful:
http://www.howtoforge.com/how-to-configure-ssh-keys-authentication-with-putty-and-linux-server-in-5-quick-steps
http://www.tonido.com/blog/index.php/2009/02/20/ssh-without-password-using-putty/#.VcMLSvmqpn8