At every IBM Notes 9.0 presentation we've seen the "Updates" tab in IBM Notes 9.0, where you could see your Home Page from IBM Connections 4.0 ( at least 4.0 CR3)

This is not a default option, and you can find how setup this scenario at this document: Adding IBM Connections Activity Stream and Embedded Experience gadgets to the IBM Notes Widget Catalog.

You can find further information at the wiki entry Integration with IBM Connections 4

My doubt is, are there predefined gadgets to connect to public places like IBM Greenhouse, DeveloperWorks or even SmartCloud for Business ?