Undoubtedly. Do I believe there's a Star Trek-esque situation of hundreds of species possessing near-identical technology? No. But the likelihood that sentient beings exist elsewhere is too great to simply dismiss. Anyone who denies the possibility outright doesn't have an adequate understanding of the scope of the universe. It is estimated that there are 2-4 hundred BILLION stars in the milky way galaxy alone. That's Billion, with a B. And that's one galaxy, out of literally hundreds of billions of galaxies. Assume one out of 3 star systems have planets (a low estimate, given what we know about star formation), and we're talking about 65-133 BILLION planetary systems in our galaxy alone. Assume that 1/15 of these planetary systems has rocky planets in close enough proximity to the sun to support liquid water (the so-called Goldilocks zone - as liquid water is absolutely essential to support life in any form we would recognize), and we're still dealing with several BILLION star systems with the potential for planets with liquid water. Out of these billions of planets, most would have life of varying degrees of complexity, if our understanding of how life on earth arose is of any validity. If the planet is stable enough climatically, free from catastrophic impact and catastrophic bouts of vulcanism, it is exceedingly likely that intelligent life will eventually arise. Intelligent life does not necessarily mean civilizations in a form we would recognize, but sentience is EXTREMELY likely.

Therefore, given the sheer scope of the universe, I would be utterly shocked if intelligent life is not somewhat common.