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Even though it was a series of flukes that led to life evolving on Earth, it's not out of the question to imaging another series of flukes happening elsewhere in the universe, on any earth-like planet orbiting any of the gazillion sun-like stars in our universe.
The problem is distance and time though... Life may exist elsewhere, but it could've existed at an earlier time, like 3 billion years ago on Mars.
Or it could exist now on some distant planet, but because of the immense distances, it's millions of light years away and we'll never know about it.
I think the best we could hope for in our life times, is to find microbacterial or other primitive forms of life on Titan or Mars. It'd be nice to find some form of plant life but I just can't see it happening at this stage.
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