What's the chance of actually finding them? (Score 1)

I'd say it's slim unless mankind manages to get off this rock in the next few millenia and actually manages to colonize other planets or maybe even other solar systems. But that has nothing to do with whether or not extraterrestrial intelligence actually exists. Our universe is filled with galaxies, each filled with star systems, some of which have rather hospitable planets. Some may say that's a pretty ridiculous assumption, that there are other life-supporting planets out there, but the sheer number of other stars makes it rather probable for at least one other planet to be inhabited by a sentient race. So what's all this boil down to? Well I say we shouldn't be thinking about this, at ALL. If for some reason one day humans make contact, it's most likely not going to be in the near future (by that I mean in the next few millenia), and I think it's safe to say it's not going to be because of donated clock cycles. We're approaching this whole situation with a brute-force strategy (keep looking, keep sending messages saying "Hey speak up"..) and I personally doubt that a) We're going to "see" anything, b) Anyone's going to "hear" anything, and c) If they do, they're not going to have the first clue as to who we are, what we want, or what the hell we're saying in the first place. So my solution to this whole problem is to not give the search for extraterrestrial intelligence another thought for another couple centuries or millenia when mankind stumbles on some crazy new technology that'll end up either dropping us on an alien's doorstep or dropping an alien on our doorstep. And that's that.