Does anyone have any experience with the subject line.
IIRC do a google for "JTableTree" and "JTreeTable". There was an article/tutorial a very long time ago on the JDC, or swing-pages, or one of the other semi-official java places about implementing a file-system-browser by combining Table and Tree. So, it's probably exactly what you want
Whenever I need something similar, I just go and look up that article/tutorial/etc. I don't think it's part of any of the Swing trails though I could be wrong...