There is an interesting story on the NASA homepage, and circulating in various media channels about the possibility of life existing on Titan. Depending on your point of view that is all it is - an interesting story - and yet it raises many interesting intellectual and philosophical questions.
Life on Mars is something that we are, on the whole, comfortable with. While it would be a sensation should life ever be discovered, it would not be a shock. For well over 100 years the concept of Martian lifeforms has, at various times, dominated both the scientific and science fiction realms. Any postulated lifeform is essentially similar to Earth type lifeforms adapted for the relative harshness of the Martian environment. With this, we can cope.