Devantech sonar range finder with a single-wire interface. Max range of 4m (13.12ft). Drop-in replacement for the SRF04.
Super small I2C sonar ranging module from Devantech, Ltd. Measures from 3cm to 6m with a 40kHz ping.
The Devantech SRF02 ultrasonic ranging module has both I2C and serial interfaces with a range of 16cm to 6m with separate burst and ranging control.