In terms of inteliegent life elsewhere in our galaxy, I remeber reading an article in SciAm where they discussed the possibiltiy of a civilization that collonized other planets. Even if each new colony took, on average, 1000 years before it was able to send out the next set of pioneers the entire galaxy could be "populated" in a few milion years, not that long evolutionarly speaking.
Really? Wow. That's some pretty solid evidence for there not being any other intelligent life on our galaxy.