A different kind of atmosphere, what gasses other than oxygen could be used by alien life forms?

I am trying to build a truly alien form of life, and easily found several replacements for water, such as methane or ammonia, with there own unique advantages and disadvantages (Wikipedia has a wonderful article on this). But I am having difficulty finding a good atmosphere that a creature could breathe other than oxygen.

The one gas I have found is a compound of sulfur oxide, which is currently used by certain types of bacteria that live near underwater volcanoes instead of oxygen.

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A different kind of atmosphere, what gasses other than oxygen could be used by alien life forms?

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