Yeah -- unfortunately, while cross-platform is handy for me, it's not so handy for people used to their native interfaces.

Drag-and-drop (native-to-java) can be done with JDK 1.2. But unfortunately, there is no 1.2 impl for Mac, so I intentionally avoided it. Kind of disappointing. There is some basic drag and drop support within the application itself (tree-to-tree and table-to-table).