Last year around this time I posted what became a top 10 page for my blog, the IBM Connections 4.0 installation spreadsheet. I took the IBM Wiki page provided and broke it down by topics (IHS, WAS, DB2, etc) and included some items along the way as well.
For those that need, that is, should be, documenting your installation details, hopefully this helps make your life easier.
Yesterday IBM posted an update for 4.5 CR1 here.
I have updated my spreadsheet and included the changes as posted as well.
You can get the new version and make sure it says 45 in the title here or from my Downloads page.