I'd be very skeptical that our solar system is unique. There is something like 100 billion solar systems in our galaxy, and maybe 100 billion galaxies (say this in you best Carl Sagan voice).
We have already discovered at least 100 new planets outside our solar system, and we are even close to discovering far away earth-sized planets.
More about extra-solar planets:
http://www.planetary.org/extrasolar/index.html
Today, slightly more than 100 planets have been discovered and generally accepted by the astronomical community. None of them is anything like the Earth, with most of them gas giants like Jupiter, orbiting very close to their stars on highly eccentric orbits. This is largely because such planets are the easiest to detect with the discovery methods currently used. But gradually smaller and smaller planets are found, and longer and more circular planetary orbits are detected. All indications are that within the next few decades scientists will know with some confidence what types of planets are out there, and whether our own Solar System is a commonplace or an aberration
