A picture is worth a thousand words.
This is especially true during performance problem investigations where a well done graph of the issue can often cut resolution time from days to mere minutes.
ORACLE database provides a wealth of performance information, but unfortunately only a small part of it is currently visualized by standard tools, such as Enterprise Manager.
Enter "R": a well known (and free) statistical analysis and graphing framework that can create relevant and interesting visualizations on pretty much any data.
Come to this presentation to learn how with a bit of R knowledge, you can make your ASH, AWR, 10046 trace, listener log etc data come alive.