Treaties in Force (TIF)
(US Dept. of State) This is also available electronically throught LexisNexis, HeinOnLine and Westlaw
Treaties and Other International Acts (TIAS)
(US Dept. of State)
United Nations Treaty Series (UNTS)
Contains the text of bilateran and multilateral treaties, and their status.
Flare Index to Treaties
EISIL: Electronic INformation System for International Law. Publichsed by the American Society of International Law