There is some additions for SCOM 2007 available at MS Connect website

OpsMgr 2007 RC2 – SDK docs and samples
This package contains the OpsMgr 2007 RC2 SDK documentation chm. It also includes samples that show a number of scenarios around using the SDK apis to insert data into OpsMgr 2007 and also using the Operations Manager connector framework.

Management Pack Building Resources for RC2
This package contains everything you will need to build a management pack on OpsMgr 2007 RC2. It includes the following:
-Authoring guide (PDF)
-Sample MPs
-Application MPs (XML files)
-Schema XSD and MAML schema files
-Authoring Console
-System Management packs

Also “OpsMgr Management Pack Guides” has been updated since RC2 release