Back at MMS2012 Microsoft announced they would be releasing two new authoring tools for Operations Manager (SCOM).
Well after a little delay, they've now been released.
The Visio Management Pack Designer can be found here:
The Visual Studio Authoring Extensions can be found here:
They're a little self explanatory, but basically the Visio MP Designer allows you to graphically design a management pack within Visio, using built in best practice methods to fairly quickly generate a management pack.
Likewise the Visual Studio extensions add class types and discovery rules etc into Visual Studio.
I'm certainly not a developer and it will be a while before I get chance to test this, but Michel Kamp has written an excellent blog post showing prelease version here:
VS Extensions: http://social.technet.microsoft.com/wiki/contents/articles/5236.visual-studio-authoring-extensions-for-system-center-2012-operations-manager-en-us.aspx
Visio MP Designer: http://social.technet.microsoft.com/wiki/contents/articles/5235.visio-management-pack-designer-for-system-center-2012-operations-manager-en-us.aspx
*Images linked from the Microsoft TechNet Wiki's*