There's going to be a pointer in the next version of the Database VM Image to some OTN Tech Casts.  This is list is from Todd in the OTN Team which anyone who knows Todd means this is no-nonsense straight with development.  I thought I should pass it along.  Here's the note from Todd:

A lot of different technologies and work has gone into the creation of this Database App Development VirtualBox image.

The selection criteria used was:
  1. Technically relevant, not marketing
  2. Interesting or enlightening
  3. Pre-View, or a look behind the scenes of where dev and engineering are headed.
Most of the OTN TechCasts are 10-15min, the guests are all from development and engineering.

Database App Development :
Engineered Systems :
Oracle Linux :
Virtualization :

Database Services in the Cloud :