We've covered the basic layout managers; with them, you should be able to create just about any user interface you like.
But that's not all, folks. If you want to experiment with layout managers that are undocumented, may change, and may not be available locally on all platforms, look in the sun.awt classes. You'll find a HorizBagLayout, a VerticalBagLayout, an OrientableFlowLayout, and a VariableGridLayout. Furthermore, public-domain layout managers of all descriptions are beginning to appear on the Net; keep your eye on Gamelan and the other Java archives.