SharePoint 2013: How to Configure SQL Server Reporting Services 2012
7-8-2014: To find the accurate and updated information please refer to 'How to setup, configure and test SQL 2012 SSRS with SharePoint 2013' article.
5-12-2014: Please disregard this article. The information in it is not accurate for SharePoint 2013. You can find the correct information documented here: Install Reporting Services SharePoint Mode as a Single Server Farm
REMOVED THE CONTENT, AS ITS NOT ACCURATE ANYMORE FOR SHAREPOINT 2013!