Larry Benson collects basic information and links in one handy webpage. Most interesting are the relations of this tale to those of a few of Chaucer's contemporaries, and the connection of the tale to the courtly theme of the transforming power of love.
This page collects links to bibliographies, study guides, and audio and images.
Here's some interesting, well-sourced information about the loathly lady in Celtic and Germanic folklore.
This is an image of the first page of "The Wife of Bath's Tale" from the Ellesmere manuscript, widely considered to be the most beautiful of the Chaucer manuscripts.
This is an image of the Wife of Bath from Cambridge Manuscript GG 4.27.
This page, provided by Harvard, offers ten lessons that start with a general explanation of the principles of Middle English pronunciation and move on to actual practice with the tales themselves.
This is a helpful glossary of Middle English terms often used in Chaucer. The 100 most common words are denoted by an asterisk.