http://karlarao.wordpress.com/scripts-resources/
AWR Tableau Toolkit – create your own performance data warehouse and easily characterize the workload, CPU, IO of the entire cluster (30 instances) with months of perf data in less than 1 hour updated 20120912see eAdam
I no longer update this toolkit. This served as a version 1 of a more comprehensive tool called eAdam which I started with Carlos Sierra (the main developer), Frits Hoogland, and Randy Johnson at Enkitec.