Obvious question is how have you wired it up to the UNO and what codes on the web have you tried.
Have you looked at this tutorial Overview | Bosch BMP085 Breakout Board | Adafruit Learning System or seen this page Barometric Pressure Sensor - BMP085 Breakout - SEN-09694 - SparkFun Electronics that has links to arduino code, wiring examples and another tutorial on bildr.