There is a old book by May, Lewis, Steinberger. I think there is also a new book by May et al.
Preprints/articles by May and Guillou, see arxiv or their webpages.
Mandell and May: Equivariant orthogonal spectra and S-modules.
Adams: Prerequisites (on equivariant stable homotopy theory) for Carlsson’s lectures. In LNM1051 (1982)
Blumberg: Continuous functors as a model for the equivariant stable homotopy category. http://arxiv.org/abs/math/0505512
http://golem.ph.utexas.edu/category/2010/01/equivariant_stable_homotopy_th.html
nLab page on Equivariant homotopy theory