Bye, Bye Voyager...

So Voyager has reached the end of the Solar System. Incredible feat. I'm ashamed to admit it, but I don't know the answer to this. Doeas anyone know what the escape velocity to our solar system is? It seems to me, but because of the suns gravitational pull, voyager should become a comet and fall back toward the sun. I don't know what the speed it would need to break the sun's pull though.
http://news.yahoo.com/news?tmpl=story2& ... &printer=1
http://news.yahoo.com/news?tmpl=story2& ... &printer=1