Class reserve list at Dacus library
The Oxford English Dictionary: online at Dacus Library: http://www2.winthrop.edu/dacus/resources/alldatabasesItoO.htm#OED
The Middle English Dictionary: hard copy in Dacus Reference section : PE679 .M54 and online at http://quod.lib.umich.edu/m/med/
If you want to buy some kind of dictionary, I recommend Norman Davis's A Chaucer Glossary, which you should be able to pick up for around $15 used
Harvard University Chaucer site: http://www.courses.fas.harvard.edu/~chaucer/
The Chaucer Metapage at UNC-CH: http://www.unc.edu/depts/chaucer/
Teach Yourself to Read Chaucer (Harvard): http://www.courses.fas.harvard.edu/~chaucer/teachslf/less-0.htm
Edwin Duncan's Chaucer Page: http://www.towson.edu/~duncan/chauhom3.html
New Chaucer Society's list of Chaucer links (not entirely up-to-date): http://artsci.wustl.edu/~chaucer/links.php
Dan Kline's Chaucer Pedagogy Page: http://afdtk.uaa.alaska.edu/pedagogy.htm
Jane Zatta's Chaucer links (we miss you, Jane!): http://faculty.winthrop.edu/kosterj/engl511/zattalinks.htm
The illustrations from the Ellesmere Chaucer: http://www.liu.edu/cwis/cwp/library/sc/chaucer/chaucer.htm
Bibliographies and Major Reference Sites
Chaucer Bibliography Online: http://uchaucer.utsa.edu
The Essential Chaucer Bibliography (through 1975)--Fisher and Allen: http://colfa.utsa.edu/chaucer/
Online Index to The Chaucer Review, vols. 1-30: http://www3.baylor.edu/~Chaucer_Bibliography/
The Luminarium Anthology of Middle English Literature and Resources: http://www.luminarium.org/medlit/
The Fordham ORB Internet Medieval Sourcebook: http://www.fordham.edu/halsall/sbook.html
The ORB's Medieval England links: http://www.the-orb.net/textbooks/muhlberger/muhlindex.html
NetSerf's medieval information portal: http://www.netserf.org/
The Voice of the Shuttle database for all things in the humanities: http://vos.ucsb.edu/
The Labyrinth (one of the biggest on-line resources for medieval studies): http://labyrinth.georgetown.edu
Jack Lynch's Medieval Resources on line: http://andromeda.rutgers.edu/~jlynch/Lit/medieval.html
Middle English Dictionary: http://quod.lib.umich.edu/m/med/
University of Calgary's "Brief Guide to Middle English Grammar": http://www.ucalgary.ca/UofC/eduweb/engl381/MEmenu.htm
The Glossarial Index of Middle English (mostly Chaucer): http://www.hti.umich.edu/english/gloss/
Ed Duncan's Basic Chaucer glossary: http://www.towson.edu/~duncan/glossary.html
Maud McInerney's one-page guide to Middle English grammar: http://www.haverford.edu/engl/chaucer/grammar.htm
The Vulgate Bible (closest version to the version known in Medieval England): http://www.ccel.org/c/challoner/douayrheims/dr.html
The Douay-Rheims Bible (English translation of the Vulgate Bible): http://www.ccel.org/c/challoner/douayrheims/dr.html
Bill Peterson's guide to Religion and English Literature: http://www.english.umd.edu/englfac/WPeterson/ELR/elr.htm
University of Kansas's library's links for medieval research: http://www.ku.edu/kansas/med/ref.htm#bibhttp://www.ku.edu/kansas/med/ref.htm
D-Scriptorium, an amazing site for digital images of medieval manuscripts: http://www.byu.edu/~hurlbut/dscriptorium/
The Bodleian Library's online medieval manuscript images: http://www.bodley.ox.ac.uk/dept/scwmss/wmss/medieval/browse.htm
British Medieval History timelines, chronologies, and all sorts of useful historical dates: http://www.btinternet.com/~timeref/
Jane Zatta's brief, illustrated overview of major events in 14th century history: http://www.unc.edu/depts/chaucer/zatta/14thcent.html
Lots of History of the English Language Links: http://www.towson.edu/~duncan/hellinks.html
TEAMS Middle English Texts site (every edition published by TEAMS is here!): http://www.lib.rochester.edu/camelot/teams/tmsmenu.htm
The Middle English Texts Collection at the University of Virginia's E-Text Center: http://etext.lib.virginia.edu/mideng.browse.html
William Langland links: http://library.marist.edu/diglib/english/englishliterature/medieval-lit/langland-william.htm
The Margery Kempe Web Page: http://www.holycross.edu/departments/visarts/projects/kempe/ (If this doesn't work, go to www.holycross.edu and look for Sarah Stanbury's faculty web page.)
The Julian of Norwich Web Page: http://www.umilta.net/julian.html
The Camelot Project at the University of Rochester (all things Arthurian): http://www.lib.rochester.edu/camelot/cphome.stm
Bob Hasenfrantz's online edition of Ancrene Wisse: http://www.lib.rochester.edu/camelot/teams/awintro.htm
The TEAMS online collection of edited Middle English texts: http://www.teamsmedieval.org/
Dr. Koster's haphazard list of Medieval Drama resources: http://faculty.winthrop.edu/kosterj/engl325/online.htm
Dr. Koster's Arthurian Lit resources page: http://faculty.winthrop.edu/kosterj/engl320/resources.htm
Middle English costume terms: http://www.larsdatter.com/chaucer.htm