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If you're into developing composite applications, there are tools you wouldn't want to miss. IBM has provided the Composite Application Debug Tools which are invaluable for every CA developer.

The tools are actually not new (they've been released in June 2007) but they haven't gotten much coverage yet so I hope to help make them known better.

Here's the description:

Property Broker Monitor: This tool is used for run time analysis of the property broker registry and events happening in the broker. The different tabs are dynamic and represent real-time events and data. They will all change as the environment changes around it. You can accomplish the following with the tool: Use the Console tab to see the different events happening in the broker.
The Current Page tab shows the components on the current page. It shows the actions and parameters for each of the components.
The Active Actions tab shows all active registered actions currently in the broker.
Active Wires tab shows all of the currently enabled wires in the broker.
Trace Properties with additional logging.

Topology Peek: This tool is used to see what the internal topology cache for the installed composite application looks like. It shows in a UI what is currently present in the cache. In general, if it is not in the Topology Peek it is not in the cached presentation of the application. This can assist in what the applications consists of on the client and should be refreshed when CA XML and definitions change on the fly.

Update

There's also the "Debugging and Troubleshooting Composite Applications" entry in the Composite Applications Wiki which provides some additional helpful information on debugging composite apps.