Some nLab entries:
infinity-one category-category)
http://www.ncatlab.org/nlab/show/(infinity,1)-topos
http://www.ncatlab.org/nlab/show/%28infinity%2C1%29-category+of+%28infinity%2C1%29-sheaves
http://www.ncatlab.org/nlab/show/homotopy+category+of+an+(infinity,1)-category
http://ncatlab.org/nlab/show/%28infinity%2C1%29-functor
http://ncatlab.org/nlab/show/%28infinity%2C1%29-presheaf
http://www.ncatlab.org/nlab/show/higher+category+theory+-+contents
A model structure on omega-cat
nLab page on Infinity-category