Mark Rittman has a couple of posts on his blog on BI EE:
Oracle BI Suite EE 10.1.3.2 On General Release
Looking Closer at BI Suite EE 10gR3
Separately, Mark is also writing a book on Oracle BI (no, I am not involved with this book; but was, in a very, very small way :-), officially titled "Oracle Business Intelligence Suite Developers Guide". And there is a placeholder page for the book on Amazon.com. You can track Mark's progress using this label page.