As for what would life on other planets be like, I'm with Sailor Steve in that there is no way to tell what those lifeforms would be like. There is however one book, written in the late 70's, that attempts to find the questions one should ask, or can ask. Being that old, lots of the data in it is outdated, corrected or wrong but the main theme, which questions should one ask, is still valid.
The book is "Liv Bland Miljarder Stjärnor, Civilisationer i Vintergatan och Därbortom?" ("Life Among Billions of Stars, Civilizations in the Milky Way and Beyond?") by the Finnish astronomer/physicist Nils Mustelin. Like I said, some of what's in there is not up to date but it's still a good read if one is interested in the possibility of life elsewhere.
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