www.schoolhouserock.tv is must see tv.
www.oracle.com leads to Oracle marketing and other Oracle sites.
technet.oracle.com offers technical assistance and information on Oracle products.
www.solutionbeacon.com/tool_vision.htm has online Oracle Apps 11i and R12 Vision instances for training brought to you by the nice folks at Solution Beacon.
www.apps2fusion.com is one of the best resources for Oracle Applications developers wanting to expand their skills. Anil Passi and his partners have shared a wealth of knowledge. I am very grateful. I also highly recommend their book "Oracle E-Business Suite Development and Extensibility Handbook".