I truly think that one day life will be found all over the universe. If you think about it the Earth is so old that through subduction and vulcanism the Earth has turned itself inside out a couple of times. It is possible that civilizations have developed and declined leaving no trace they ever existed.
Many look outward for signs of alien life but there is also some rather bizarre life forms right here in our midst. This is a page with some rather odd living things: The MicroAngelo Image Gallery.