A good overview from Jörg Beringer head of xApp at SAP. They recognize key features of collaboration:

• Goal-Directed Collaboration
• Embedded Collaborative Services
• Collaborative Patterns
• Connecting Knowledge

What is the most interesting is the recognition of various Collaboration patterns

• Private networks that reflect the personal relationships of one person to other people
• Work groups that are set up to achieve a common goal
• Communities that consist of a loose association of people sharing one common interest

The article is there

I don't know how far SAP is going on this path to deliver new products and services, but it's worth going to SDN (SAP Developpers Network) knowledge place, one can find integration of:

• Forums
• Blogs (from SAP people and from people outside SAP)
• Documentation about SAP products and services 
• A search capability with a good taxonomy
• I haven't seen collaboration rooms, but it may be there.

You can go there.

They have even implemented an "à la passeport" SSO mechanism.