They finally managed to get an 'image' of an exo-planet: http://www.spiegel.de/wissenschaft/weltall/0,1518,525474,00.html (sorry its german)
and it seems that the planet (HD 189733b) even has water.
The laws of physic and chemistry are the same on every planet in the whole universe. So its likely that life on differents planets looks similiar to the life found on earth. Though, temperature, gravity and so on may differ.

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