We are alone
Intelligent beings absolutely exist. There is no way they cannot. The diameter of the observable universe is 93 billion light years . Let me say that again:
93 billion light years.
There is absolutely no way intelligent life hasn't developed somewhere. It's simply not possible.
 - [ame=http://en.wikipedia.org/wiki/Universe]Universe - Wikipedia, the free encyclopedia[/ame]
Humans truly aren't all perceptive when put into the spectrum of the entire (immeasurable) universe. Saying that we should have seen or heard something is assuming that we are looking in the right places. We really have no notion for what is out there. It's true - there might be nothing. But I think it is really naive to think in that manner. We should avoid absolutes in our opinions because our world is always changing. I think it is a very positive, optimistic idea, that aliens are out there somewhere, whether they be three hundred billion quattuordecillion and four light years away or just around the corner.
"All mankind is of one author, and is one volume; when one man dies, one chapter is not torn out of the book, but translated into a better language...No man is an island, entire of itself...any man's death diminishes me, because I am involved in mankind; and therefore never send to know for whom the bell tolls; it tolls for thee." - John Donne
Given the size of the observable universe it seems virtually impossible that a planet (or several thousand planets) with conditions similar to ours doesn't exist.
Given the probability of such a world (or worlds) existing it seems similarly impossible that life hasn't arisen on one of them.
The existence of intelligent life on Earth is merely the result of a cosmic crap-shoot. Given the size of the observable universe there's no reason to believe a similar crap-shoot hasn't occurred elsewhere.
I hope the new aliens will do better than the group of aliens that worked for and with the Bush administration.
Did Bush import them from other worlds. I understand that Cheney's real name from his home planet is Cheeneeeoooployy