Was emailing with my esteemed college John Beresniewicz at Oracle in the OEM group. John and I worked together on OEM 10g and thank goodness he is still there as he is generally behind any good quantitative visualizations you might see in the product. Here is one cool example he sent me:
The database load, AAS, can be time selected and from the selection a load map is shown, in this case of which objects are creating the most I/O load, group by type of I/O. Super cool. Congrats JB and I look forward to exploring more in OEM 12c “cloud control”.