IBM
Technote 4033179: Download IBM Connections (includes all the part numbers)
Technote 7035893: IBM Connections 4.0 Detailed System Requirements
IBM Connections Wiki: Connections 4.0 Documentation
and of course always remember to check Fix Central for the latest fixes.
Add this one 😉
http://www-01.ibm.com/support/docview.wss?uid=swg21610344&myns=swglotus&mynp=OCSSYGQH&mync=E
I did say to check Fix Central 🙂
Covered all the way