I don't think humanity will ever manage to get in contact with an alien species. People in this here fine thread seem to think that there are technologically advanced aliens just around the corner, and even go so far as to mention galactic wars etc. Too much Mass Effect probably
People seem to forget that the universe is a pretty damn big place, beyond any human being's imagination (and if recent theories are to be accounted, it's only one of many universes). If we've learned anything from the planets outside our solar system that we've managed to locate so far, it's that the vast VAST majority of them are incapable of sustaining any form of life (with the sole exception of Gliese 581 g, which still wouldn't be able to sustain life as we know it on Earth, but could
possibly have some sort of life, if we assume that it would flourish at extreme temperatures and without a day/night cycle).
Of course, I'm not trying to say that the universe is lifeless. It's pretty much given that life exists out there. Intelligent life however is an entirely different deal. There may very well be NO other intelligent life in our universe. Out of the billions of species that have lived on our Earth, ours is a really freaky exception that could have very very easily never happened.
Even if we assume that there are intelligent forms of life out there however, this is where the true madness begins. Contacting an alien species that is at approximately the same stage of technological advancement as we are is, in my opinion, out of the question. Neither are we likely to discover any kind of communicative species in an early agricultural / hunting stage, since that would require us to actually land and look for them. Not gonna happen, and even if it did, they would be of no use to us and we would probably exterminate them because we are assholes and their planet has high gold deposits or whatever. As for far more advanced civilizations than us... I don't think we would even count as "intelligent" to them. If such species do exist, I don't see any reason why they would give a fuck about us. They might even already know of our existence and have chosen to ignore us, the same way that we ignore ants while we're walking down the street.
As for the whole "galactic war" business... I'm not even gonna comment on that. We can't even sustain our own stock market and banks without them crashing every couple of decades, but we would be able to engage in a galactic war? Seriously.