Jide
focus managers – http://download.oracle.com/javase/tutorial/uiswing/misc/focus.html
non-modal JDialog
Substance
swingx
group layout, table layout,
inter-table event firing and update
table sorting by any column

–underweight on
pluggable look and feel
jlabel
jbutton

–my experience
threading
SwingWorker
swing timer
invokeLater…
integration with DB client making a slow query
integration with http client
integration with rmi client
EDT
jtable construction, updates