This is pretty cool news. Magnetic readings aboard Voyager I show a change which indicates that the spacecraft has left the influence of the sun, a fluctuating boundary called the Termination Shock, and entered into a region called the Heliosheath. Sure, Heliosheath sounds like some sort of weird condom, but it's still cool.

NASA

"Voyager has entered the final lap on its race to the edge of interstellar space, as it begins exploring the solar system's final frontier," said Dr. Edward Stone, Voyager project scientist at the California Institute of Technology in Pasadena. Caltech manages NASA's Jet Propulsion Laboratory in Pasadena, which built and operates Voyager 1 and its twin, Voyager 2.

...

"The consensus of the team now is that Voyager 1, at 8.7 billion miles from the Sun, has at last entered the heliosheath, the region beyond the termination shock," said Dr. John Richardson from MIT, Principal Investigator of the Voyager plasma science investigation.

There are a lot of pictures and some video at NASA explaining all of this.

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