This area was completely rewired less than 3 years ago. Problem was, when the wiring was switched over to the new, the guy who did it was a voice guy, and he just tapped into the pair rather than cut and splice.
They ADDED a bridge tap to my DSL line about a year after it was installed. That completely screwed up my DSL -- I didn't get anything until it was fixed -- which required a couple calls to my ISP, two PacBell trips (they didn't fix it the first time), and a Covad trip (since somehow one of the wires at the wiring box became disconnected).