No Title Life in the Solar System Mars - Speculation since 19th century. Discovery of Martian meterite in August 1996 which was claimed to have fossilized microscopic life. The debate continues on the validity of this claim.
Future missions hope to actually return Mars samples to Earth.
A future mission 'Beagle-2' by ESA is planned for launch in 2003 and would do extensive tests at Mars. Still awfully cold to support life. Titan - Between Mars and Mercury in size. Has a thick nitrogen atmosphere with methane and ethane, possibly even lakes of liquid methane. To be probed with 'Huygens' lander in 2004.