Actually - in very recently published research - people have found that some organic molecules very close to the sugars found in DNA exist in meteorites and it's been known for a while that organic molecules are found in space especially in meteor fragments. We're probably leaning somewhat closer to finder at least some of the raw materials being seeded from space.
From the AP Sugar Compounds Found in Meteorites
Sugar compounds, an indispensable ingredient for life today, have been found in meteorites, bolstering the theory that chunks of rock from outer space delivered the materials that gave rise to life in Earth. Another key ingredient, amino acids, has already been found in meteorites. George Cooper of NASA (news - web sites)'s Ames Research Center at Moffett Field, Calif., said that while it has not been proved that meteorites delivered the materials that led to life, the discovery means meteorites containing the building blocks were at least present on the planet early in its history
I've seen that, but it still begs the question where the "seed" originated from. I'm reminded of the old legends that said that the world rests on the back of a giant turtle. When asked what the turtle is standing on, the answer is another turtle, and eventually the answer is given that "it's turtles all the way down". Harumph. Still, this info is very interesting and may in fact lead to a greater understanding of how life on Earth originated.
And now I'm off to bed, it's late and I'm tired.