Resources on Chaucer are so prolific that I have divided this resource list into sub-categories:
Chaucer Online: Includes both general interest and scholarly digital resources.
Chaucer Print Resources: Print research pointers for both beginning and advanced students.
Chaucer Manuscripts: Includes links to single-page images and full digital facsimiles of Chaucer's work. Anyone interested in Chaucerian manuscripts beyond the "oooh, shiny!" factor should begin with An Introduction to Medieval Manuscripts.