Topic on Talk:Wine
Awesome !
5.1 sound is supported since a couple of hours (thanks to Mark Harmstone's fantastic work)
Next milestones: full hardware emulation (I don't think it's included atm), 8 channel support and closing these
EDIT: other patches have still to come
EDIT2: hardware buffers should be arrived (when in XP mode)
EDIT3: And here's EAX! Together with some miscellaneous
EDIT4: changelog list is here