Well, this isn't much of a debate . Everyone's agreeing that the likelihood of there NOT being life somewhere out there is insanely small, including me.
The universe we live in is unimaginably huge. As others have mentioned, theres at least billions of other galaxies, each with billions of stars, and each of those likely to have planets of their own. Then you've got all the other pieces of debris floating around space, like asteroids, meteors, moons & so on. If we're the only living things on all these lumps of rock & other garbage floating around space, that'll make us one hell of a fluke!!
There's also another angle to think of too.
[metal panel]WARNING: SCIENCE CONTENT[/metal panel]
(Sorry, couldn't help it. Blame the Mythbusters...)
If you pick up any info on the theory designed to explain the universe called "String Theory", you'll more than likely hear them describe the possibility of other realities. I was channel surfing expecting to find music videos when I instead found a show describing how the universe is supposed to work, which kinda got me hooked since there wasn't anything else on.
The part that really stuck in my mind is that there is potentially infinite other realities out there. They describe gravity forming loops of energy, which drift between these universes, with new ones being created every time a variation happens. Say someone drops a water bomb from a higher level onto someone below. In one reality, it hits drenching the victim, while meanwhile a new one is made where they move aside at the last minute & it misses, hitting the person in charge instead. In that reality they dropper gets busted, while in the first the victim has to go home to change.
Now, with all these realities popping up, there's also the possibility we could get visitors from these other realities, where history has taken another path & technology is different. Heck, there's even the chance we could learn to pass into then directly out of one of these realities, allowing us to travel to other planets in our reality in no time. As they say in Event Horizon, the shortest distance between 2 locations is nothing...
OK, I think I've sounded geeky enough to last the year...