1) This article is by a scientist looking at intelligent life from the standpoint of evolution. (improbable)
http://www1.uea.ac.uk/cm/home/servic...t%2Bthere%253F
2) The other considration is that life was created here by God and that He may have created life elsewhere. (improbable or at least irrelevent) If He did, He has not chosen to tell us anything about it.