Hi Kathy,
psqlodbc-08.00.0102 is the official ODBC driver of the PostgreSQL community. This driver is also partially 3.x compliant whereas the driver provided by unixODBC is ODBC 2 compliant. Also psqlodbc-08.00.0102 has lot of bug fixes gone into it.
I believe the ODBC driver by unixODBC is little bit old.
I would suggest you to go and have your hands on libpq enabled ODBC driver.
Of which 08.01.0103 is the latest, though if you can wait a couple of days, I expect there will be a new one.
Regards, Dave.