Search noteboard

Hello - I am very sorry for daft question, I am a complete SharePoint n00b.

I am trying to search across noteboard content on SharePoint 2010.  I thought I would be able to define a search scope just for noteboard, but can't figure out how to do this.  I assumed this would be a contentype or contentclass within the search scope property, but struggling with the syntax.

Any advice, pointers greatly appreciated.

Thanks

@paulrollings