This post is almost a direct copy of my reply to the OBIEE EMG mailing list started by Mark Rittman about Initial Opinions on OBIEE 11g?.
I can't say I've had any success installing the software. So far I've tried on XP Pro (VM on laptop) and Server 2008 (AWS instance). I've chosen the Enterprise install each time.
The laptop I can understand, sort of, as it is severely underpowered. 3 GB RAM total for the machine. I understand the integration with WebLogic/Fusion, but it makes it that much more difficult for those starting out to get it up and running on their personal machines. I can still install the database on my laptop; in fact I have 3 or 4 versions (in VMs) on my machine right now. That's nice.
A couple of days ago, I fired up a cloud Windows Server 2008 server with 18 GB RAM. Installed the database. Created the BI metadata (rcu). Finally began the OBIEE install (Enterprise). It failed finally on one of the configuration steps (12 of 13), I believe it was one of the opmnctl processes.
That said, I haven't read the install documents from front to back yet. I have, however, installed a lot of Oracle software over the years, including EM, OAS (10g), etc. I can usually get the software up and running. This is a different beast though and is not for the weak.
I'll eventually read the docs, sooner rather than later.
On the bright side, installing the latest 11g forces people to learn a bit more about the interactions of the database, EM, WebLogic, etc. That's a good thing.