Trunk is largely dead IIUC - alcor went off to work on QSB, and etienne is maintaining B5X over trunk - though I noticed etienne recently commiting lots to crucible, which is the new core library that was going to go into QS trunk.
B5X has substantial fixes for Leopard (triggers etc.), folded in lots of changes made to reduce memory use and "bloat". But etienne only has partial access to plugin code so can only do so much; alcor still hasn't released some of the plugin code. Some fixed plugins are available here: http://code.google.com/p/blacktree-elements-public/downloads/list etienne is the only real person working on code at the moment, including fixing things up for snow leopard etc.
