1. Web guides:

• Georgetown Law Center Treaty Research guide.
  This site gives a clear, comprehensive list of research tools (paper and web).
• ASIL Guide to Electronic Resources for International Law: Treaties  
  <http://www.asil.org/resource/treaty1.htm> (see the other topical chapters).
• Fundamentals of Treaty Research - U.S. and Non-U.S. (Electronic/Online Resources)
  <http://www.lib.uchicago.edu/~llou/treaties.html>
• NYU Law Library, International Treaties
  <http://www.law.nyu.edu/library/foreign_intl/treaties.html>
  Links to many other guides on the web.
• Research: International (BU Law Library)
  <http://www.bu.edu/lawlibrary/research/int>
• Research Guide to International Law on the Internet
  <http://www.spfo.unibo.it/spolfo/ILMAIN.htm>
• Treaties Research Guide
  <http://www.law.duke.edu/lib/libser/publicat/researchGuides/treaties/treatyframe.html>

2. Some useful full-text web treaty collections:

• United Nations Treaty Collection
  <http://untreaty.un.org>
• ECOLEX
  <http://www.ecolex.org/
• Environmental Treaties and Resource Indicators
  <http://sedac.ciesin.org/entri>
• Council of Europe, European Treaties
  <http://conventions.coe.int/>
• Hague Conventions on Private International Law
  <http://www.hcch.net/index_en.php>
• International Humanitarian Law
  <http://www.icrc.org/ihl>
• International Labour Organization
  <http://www.ilo.org/ilolex/english/convdisp1.htm>
• Multilaterals Project
  <http://fletcher.tufts.edu/multilaterals.html>
• WIPO Treaties
  <http://www.wipo.int/treaties/en/>
• http://europa.eu/abc/treaties/index_fr.htm
  Textes fondateurs de l'Union européenne
  Acte Unique, Traité sur l'Union Européenne, projet de Traité d'Amsterdam, etc.
  
• http://untreaty.un.org/
  Base de données des Nations Unies sur les Traités (français/anglais)
  
• http://www.un.org/french/docs/
  Textes Officiels des Nations Unies (français/anglais)
  Charte, Déclarations, Lois 
• http://www.lawguru.com/ilawlib/home.htm
  U.S. House of Reps. - Internet Law Library - Treaties/International law (English) Links to hundreds of official International Law texts, treaties, trade agreements, conventions, declarations, international court decisions.