As I discussed in the past, the Oracle Learning Library isn't just about Oracle Application Express or the Oracle Database. There is content there for virtually every Oracle product offered - JD Edwards, NetBeans, Solaris, Java, Oracle Business Intelligence, Fusion Middleware, Oracle E-Business Suite, etc. There are tutorials, white papers, Oracle By Examples, demonstrations, data sheets, and more.
And at the risk of being criticized (again), I can proudly proclaim that this is all running entirely on Oracle Application Express at http://apex.oracle.com - the same hosted instance of Oracle Application Express that gets over 10 million page views a week and between 600 - 700 new workspace requests every week.
