I found this the other night :

Z-Wave Alliance members exhibiting at EHX Spring 2008 include: BTX (#351), Capitol Sales (#1342), Cooper Wiring Devices (#547), Draper (DR232A), ELK Products (#212), Embedded Automation (DR240C), Exceptional Innovations (#901), Hunter Douglas (#930), Leviton (#1022), Logitech (#312), RCS (#1038), Somfy (#1330), Superna (#1421), Universal Electronics (#1911), Universal Remote Control (#530) and Worthington Distribution (#2105).

Just put in a order for a bunch of Leviton controllers and dimmers, and can't wait to
try them out !