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The Most Likely Places to Find Alien Life according to Seth Shostak of the SETI institute are Enceladus (small moon of Saturn), Titan, Mars, Europa, Venus, Callisto and Ganymede (Jupiter moons).

Mind you, the EXTREME climates on these extraterrestrial candidates are not hospitable to human life, without some well-engineered terra-forming.

However, we have examples on the Earth of life developing under extremes:
crushing pressures at ocean depths; temperatures beyond the boiling point of water where we've found life, thus the theory: if in these places, then elsewhere beyond our solar system.