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THE WOLF

Wolves in nature are a fascinating social predator; in our culture wolves are a mythic primal force seen with fear and awe.  Some see them as an embodiment of all that is free and wild, others as a demon that steals life and livelihood.  There are lots of pages with new-agey fluff, and I've tried to avoid those.

Wolf Education and Research Center has biology and behavioral information as well as current wolf news.

Lioncrusher's Wolf Page  has some very useful info on biology, evolution, communication, etc.  Part of a comprehensive site about the Carnivores.

Wolf page from the Wildlife Science Center

Timber Wolf Information Network 

The Wolf Society of Great Britain strives to increase public awareness of the true nature of wolves and facilitate education which will lead to increased tolerance and understanding where wolves and humans co-exist.

Wikipedia article on Gray Wolves.
A summary of wolf species from the BBC.

The InternationalWolf Center supports the survival of the wolf around the world by teaching about its life, its association with other species and its dynamic relationship to humans.

Wild Sentry: Attempting to educate the public about wolves without either romanticizing or vilifying them.
A web site dealing with the gray wolves of the Great Lakes.
Wolf Haven International 
Wolf Song site.

Red Wolves (Canis rufus) are native to the southeastern United States.  Great efforts have been made to maintain small populations in the wild. Alligator River is one of the more successful attempts.

Ethiopian wolf (Canis simensis)
Dire Wolves

The Dire Wolf (Canis dirus) a large now-extinct wolf, left many fossils in the la Brea tarpits.

Another Dire Wolf page, from the La Brea Exploration Guide.
Another Dire Wolf mention, comparing them to timber wolves and dogs.
Wolf Attacks
Here is a list of books and articles on wolf encounters and attacks.  Unfortunately, I'm not near a university library so I can't look up the key ones, like the J. of Mamm. article form 1947.
This site lists a number of recorded wolf attacks.  The site is rabidly anti-predator, so take it with a grain of salt until you can verify the reports (and if you do so, let me know!).
General Canids
Links for various canids but emphasizing wolves, from Nearctica
More canid links, from Bill's Wildlife Sites
The IUCN/SSC Canid Specialist Group's Canid Species Accounts.