As I was browsing the Microsoft Technet site (most recent downloads) I came across a renewed documentation package for Operations Manager 2007 R2.
In this package you'll find everything you need for administering and authoring your OpsMgr environment, including XPlat! Also an easy way to complete your documentation library if it's not already up-to-date.
Here's a list with the contents:
If you want it all, just use the last download link
- System Center Operations Manager 2007 R2 Documentation.zip
Even for the more experienced people there's a change already known documents are updated since the last time they were used in the field. So check it out.