This has been well covered - but the odds of someone finding Voyager, as compared to the approximately 30 Light Year Radius of Radio Energy we've been pumping out, is a number which pretty much approximates zero.
Actually V1 has a 20W transmitter on-board that will stay operational until around 2025. It's busy crossing into the Heliopause which means it's a transmitter far from the noise and obstructions of the solar system. The craft will fully cross into the Heliopause in around 2015 so will have a decade of transmitting in deep space.
