There is some new content on OTN, around training and its looking pretty good.
http://www.oracle.com/technology/obe/obe_bi/bipub/index.html
There's some neat stuff in there, in particular the Advanced Features, not really really advanced but some very useful subjects get covered, drillable reports, multi data reports and finally some data templates. I have not tried the Disco integration OBE but fully intend to take it for a spin later this week. Enjoy!