I recently installed a IBM Connections 3.0.1 pilot system over a Linux Suse SLES 64bit OS (one VM box for DB2+TDI, the other for WSA+Connections etc, 4 GB RAM each).
After some googling I found out the Christoph Stoettner 's nice slides on the subject (written in German).
I dare to contact him by email for the very first asking him the English version of his guide:
since there's no English version of his guide, he pointed out to another guide, the Lotusphere 2012 Show300 "Become a Connections Hero- Install and Configure IBM Connections" session by Rob Thatcher & Mike Cross
Thanks Christoph, Rob and Mike. The system is up and running, time to test it (seems very faaast!).
I also installed some Lotus Notes's plug-ins to work with Connections Activities, Status Updates and Files (see catalog here)