Oracle has provided lot of Demonstration/Viewlet/Videos on Oracle features like RMAN,Flashback,standby etc
Each demonstration has a description and links to the demo. Some demos have a ‘demo’ link that will play in your browser on any platform. Others have a ‘download’ link which will download an executable file to your computer that will only play on a Windows system. Some demos offer both options.
Here are the links to them
These Oracle videos from Oracle network only. I am just gathered all the information and put it on a post for you to view the single webpage
Please do provide the feedback