Few vehicles have done more to establish a genre and define a brand as much as the Lexus RX. Introduced over a decade ago to suburbanite real estate agents and their Napa-weekending friends, the original RX300 helped boost Lexus sales by 60% when it hit dealers in late 1998. Over the ensuing years, Lexus' posh people mover slowly evolved to include a hybrid drivetrain, a refreshed exterior and tasteful appointments that helped solidify its success. For 2010, the RX plays the same tune but adds a few more instruments, a new backbeat and reworked crescendo.