What follows is the fly tying link list from Dmoz.org
This is a small list, with a ton of good links missing.
What would you add.

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http://homepage.eircom.net/~conba/ Alice Conba Master Fly Dresser -
Patterns, tips, links, and products.
http://www.artflies.com/engelsk/ Artflies - Classic Salmon flies tied
without a vise. Provides tying instructions, information about natural
dressing materials, and photos.
http://209.196.166.212/fishmagazine/...lacknoseng.htm Black Nose
Dace - Tying instructions on the famed trout fly.
http://copperfly.net/ Copper Fly - Fly tying tutorials with step by step
instructions. Includes information about tools and dressings, and forums.
http://www.acc.umu.se/~widmark/fly/crochet.html Crocheted fly-patterns -
Crocheting instructions and variety of patterns.
http://tie1on.net/ Derek Porter's Fly Tying Workshop - Step by step
instructions with pictures, and patterns.
http://www.diptera.co.uk/ Diptera - Offers patters, tips and knots for
making a variety of freshwater and sal****er flies.
http://www.uky.edu/~agrdanny/flyfish/petti.htm FAQ - Processing Fly
Tying Materials at Home - Describes possible health hazards and safe
methods of handling, treating, and storing natural dressing materials.
http://www.FlyPools.com/ Fly Tying Exchange - Tie flies and exchange
them with other anglers from around the world.
http://www.flyswaps.com/ Fly Tying Swaps - Trade flies with other tyers.
Includes rules, FAQ, and discussion board.
http://www.danica.com/flytier/ Flytier's Page - Presents closeup photos
and tying recipes from a growing collection of world-wide tiers.
http://www.flytyer.co.uk/ Flytyer - Illustrated and photographic
patterns and tying instructions.
http://www.flytyingireland.com/ Flytying Ireland - Host of the Irish
Open Flytying Championships. Tyer profiles, fly patterns, bulletin
board, and local river guide. [May not work in all browsers]
http://www.flytyingforum.com/ FlyTyingForum.com - Community featuring
pattern database, photo gallery, entomology, tips, and swaps.
http://turcktarantula.com/ Guy Turck Fly Fishing & Tying - Original
articles as well as information and tying tips for the Turck Tarantula,
Power Ant, Snake Drake and other fly patterns. Jackson Hole fishing
information.
http://flies.hipwader.com/ HipWader.com - Extensive database of fly
patterns. Includes forums for fly tying, tackle reviews, and fishing
reports.
http://zebu.uoregon.edu/~dmason/Mckenzie/flies.html How to Tie Some
Random Flies - Selection of fly descriptions.
http://www.invictaflies.us/ Invicta Flies - Featuring patterns and
techniques. Tips on tying methods and material preservation as well.
http://www.jackiewakeford.co.uk/ Jacqueline Wakeford Flydressing
Instructor - Offers courses on flydressing from complete beginners to
advanced flydresser. Includes profile, course details and rates,
authored publications, and contact information.
http://www.geocities.com/Yosemite/Ra...aegerspey.html The Jaeger
Spey - Tying instructions for a spey type fly.
http://members.aol.com/jerrytyer/ Jerry's Fly Fishing Tips - Contains a
fly of the month with tying instructions, details of classes, and book
reviews.
http://home.online.no/~jfuruly/salmon/flybox.htm My Virtual Fly Box -
International salmon fly swaps. Includes acrchived patterns.
http://users.eastlink.ca/~dryfly/ Nova Scotia fly fishing and tying -
Nova Scotia fly fishing, tying and tall tales. Trout and salmon
patterns. Old time patterns. Nova Scotia hatch chart. Parachute
patterns, Visitor regulations. Suggested equipment. Links to many
Eastern Canada fly fishing web sites. Favorite books and videos. The
liars corner
http://home.att.net/~ferenc/ Nymphing with the RS2 Fly - Deals with
tying and fishing the RS2 fly.
http://www.onlineflytyer.com/ Online Fly Tyer - Includes pattern
database, articles, swapping forum, retail locator, and product reviews.
http://home.att.net/~kholm/PHLYTYING/ Philatelic Phly Tying - Patterns
for flies featured on postage stamps from around the world.
http://www.angelfire.com/wa/salmonid/ Salmon and Steelhead Fly-Tying
Guide - Includes patterns, facts about the species, recommended books,
articles, and Washington fishing information.
http://sal****erflytying.net/ Sal****er Fly Tying - Step by step pattern
database.
http://www.branhamssal****erflytying.com/ Sal****er Fly Tying - Tying
lessons, pattern database, step by step instructions, tying tips,
product reviews, articles, and forum.
http://www.simple-flies-for-simple.fishermen.co.uk/ Simple Flies for
Simple Sewin - Sea Trout (Sewin) patterns from around the world.
Includes photos and images, tying instructions and tips on how to use them.
http://www.ribiska-zveza.si/vezal/flyt.htm/ 18th Slovenian Open Flytying
championship - Results and photos of flies from 2005 competition.
http://www.tidepool.com/~pastortd/ The Traditional Flyfisher - Hints and
tips on fly fishing and tying as well as patterns and gear reviews.
http://www.less-stress.com/flies/ Trout Flies - Fly patterns for trout
fly fishing.
http://www.thetyingbench.com/ The Tying Bench - Hosted by master fly
fisher Mark VanPatten, television schedule and tying recipes.
http://www.tyingbench.com/ Tying Bench - Pattern database, and articles.
http://www.VirtualFlybox.com/ Virtual Flybox - Online resource featuring
tying instructions for fly patterns from around the world. Includes
swaps, articles, chat room and forums.
http://www.magiclink.com/web/wesn/index.html Wes' Virtual Pattern Book -
Presents closeup photographs, recipes, and tying instructions for a
variety of unique and unusual fresh and sal****er flies. Includes kids
flies, and hook conversion charts.
http://www.barnardesign.com/flytyer/ WWW Fly Tyer - Features innovative
patterns from the vice of Alan Barnard.