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Love the new insights and ideas I'm getting from this discussion, especially about focused beam communications and other tidbits that make this place so much awesome.
Me, I'm more or less settled with the facts that the Universe, even when just considering the Observable Universe, and Time (which is sort of scaled with the Universe) are extremely, unfathomably, impossibly large.
When the volume of space and the length of time is considered, I don't consider the lack of detectable life particularly perplexing because of the fact that our detection of any said species is passive to begin with at this time.
At the same time, because of the fact that even our civilization is such a tiny sliver of the existence of the rest of the universe, I wouldn't be surprised that we may have entirely missed another civilization's signals during the Ice Age or the Crusades or the Dark Ages or whatever.