Vagueness  
   Article in the Stanford Encyclopaedia of Philosophy, by Roy Sorensen.
   http://plato.stanford.edu/entries/vagueness/

Russell on Vagueness  
   Online text of Russell's 1923 article.
   http://www.santafe.edu/~shalizi/Russell/vagueness/

Vagueness, Semantics, and the Language of Thought  
   Article by Richard DeWitt.
   http://psyche.cs.monash.edu.au/v1/psyche-1-01-dewitt.html

How to Make Our Ideas Clear  
   1878 article Charles Pierce.
   http://www.peirce.org/writings/p119.html

Vague Concepts and Sorites Paradoxes  
   Article by Vlad Vieru.
   http://www.ici.ro/ici/revista/sic98_3/art09.html

Vagueness and Identity  
   Article by Loretta Torrago presented at the 20th World Congress of Philosophy. Makes the surprising argument that vagueness in identity statements is incompatible with vagueness of constitution.
   http://www.bu.edu/wcp/Papers/Meta/MetaTorr.htm

Where Demonstratives Meet Vagueness: Possible Languages  
   Article by Adam Morton, which appeared in Proc. Aristotelian Society. Argues that vagueness and demonstratives are connected, by means of constructing artificial languages in which the relationships are manufactured.
   http://cogprints.soton.ac.uk/documents/disk0/00/00/02/37/cog00000237-00/199801002.html

Liars and Heaps: The Logic and Semantics of Paradox  
   A conference to be held at the University of Connecticut, USA, on 11th-13th October 2002.
   http://vm.uconn.edu/~wwwphil/conf02.html

Vagueness and Ambiguity  
   A little test to help distinguish vagueness from ambiguity (from San Jose University's critical thinking pages).
   http://www.sjsu.edu/depts/itl/graphics/vague/vague.html

Vagueness and the Sorites Paradox  
   A resource for philosophers and other researchers, including a bibliography on vagueness, plus lists of online articles, homepages of people working in the area and related external resources.
   http://www.btinternet.com/~justin.needle/