If you're running your Java application with a J2SE 6 virtual machine, you can browse all references to an object in the variables view. Select any object in the variables view, and choose All References from the context menu. A pop-up displays all objects referring to the selected object. You can expand each node in the tree to follow references to each object. You can inspect any object in the reference tree by selecting it and pressing Ctrl+Shift+I. This opens an inspect pop-up displaying the object's fields.
This feature is available in the latest integration build and forthcoming 3.3M1 build. It's our first cut of the feature, so feedback and comments are welcome.