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Heh. Sometimes necroed threads are good. Nice rediscovery, Will.
I agree with several of your points, Will. We don't know all the theoretical conditions of life, we just know that we aren't receiving decipherable radio signals from elsewhere. That could mean any number of things: that we just haven't figured out the really obvious way to send FTL signals that all the cool aliens are using, that radio broadcasts attract the attention of the really bad guys in the universe or that intelligent life is so distant that radio signals from them get garbled so much or get "talked over" by stars and background noise that we can't hear them.
The numbers, though, are too big for us to be alone in the universe. And by "us" I mean all life on Earth, not just humans. It's possible that there's life within the solar system but that we're just not equiped to observe it at this point and that it's not intelligently sending signals out of its gravity well.
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