The product documentation for System Center Operations Manager 2007 continues to grow and evolve so if you haven't taken a look in a month or two then you might be surprised to find there's some cool new stuff out there. Here are the documents that have published since November 1, 2007:
Description: This guide describes the key concepts required to understand Operations Manager. It describes modeling, how modeling is implemented in Operations Manager, and key changes between Operations Manager 2005 and 2007.
Link: Download the Guide
Title: Best Practices for Targeting Rules and Monitors in Operations Manager 2007
Description: This poster illustrates some of the most common scenarios and provides best practices on how to properly target rules and monitors in System Center Operations Manager 2007.
Link: Download the poster
Title: System Center Data Protection 2007 Management Pack Guide for Operations Manager 2007
Description: This guide helps you deploy and use the management pack for System Center Data Protection Manager (DPM) 2007 on System Center Operations Manager 2007. It explains how to use the management pack to monitor the state of data protection and recovery for DPM servers and the computers that they protect, and to monitor key health and performance indicators on DPM servers.
J.C. Hornbeck | Manageability Knowledge Engineer
I suppose that topic should be OpsMgr 2007? :-)