With the SR1 version of the installers, the AS cubes are not created automatically (neither standard and enterprise versions, nor 2005 or 2008). We plan to change this with the SR2 version of the installers which are in development now, along with lots of bug fixes to the product samples and documentation.
If you have AS installed, you will have to manually deploy and process them using BIDS.
The database owner is the account which was used to create the databases. Because it's most likely that you executed the the MSI without prior elevation, the SQLCMD process which created the databases via a trusted connection defaulted to SYSTEM as the owner. You're welcome to change the ownership, if you wish.David Reed - MSFT - Microsoft Certified Architect|SQL Server - http://blogs.msdn.com/reedme/