There still seems to be a lot of interest in the progress of Bi-Phase Technologies (a subsidiary of The Schwan Food Company). Outside of the Schwan fleet trucks, the only vehicle(s?) with a Bi-Phase system I'm aware of is the Propane V-10 Ford Crown Victoria Police Interceptor manufactured by Scott Alder Motorsports.
However, Schwans isn't the only company with liquid propane injection (LPI) in the USA today. Clean Fuel USA (CFUSA) currently has a LPI system available for GM 8.1L engines (GMC models: C4500, C5500, C6500 and C7500). The CFUSA LPI system is based on ICOM S.p.A. JTG technology.
Besides ICOM, I believe Vialle is the other major LPG system manufacturer that has a commercially available LPI system. However, I don't believe they are anywhere close to offering this system in North America.
The Scott Alder Motorsports site is extremely out-of-date and many of its links don't work. Does anyone know if they made more Bi-Phase CVs than the prototype?