UltraRunning Magazine
Magazine for ultramarathoners, with calendars, race results and reports, techniques and tips.

Stan Jensen's Ultramarathon Guide
Provides general information on the sport, especially focusing on northern California. Includes information and statistics for the top races in the USA, as well as personal achievements, and goals.

Marathon and Beyond
Published six times a year - website contains tables of content, sneak previews and ordering information.

Hal Higdon: On The Run - Ultramarathon Training
While focusing on the Comrades Marathon, author Higdon provides a training plan useful for a wide range of ultras.

North Texas Trail Runners
Information on trail running and ultra running in North Texas. Features calendar listings and a news/opinion section.

SoCal UltraRunner's Grand Prix Series
Resource for Southern California. Includes local race results, membership details, entry forms, standings, and race calendar.

Running the Hardrock 100
First-hand account of running the Hardrock 100 through Colorado's San Juan Mountains by Bob Boeder.

American Ultrarunning Association
Membership details, race listing, USA National Ultra Team, description of the organization and related links.

UltraRunner.net
Resource for clubs and races in North America with upcoming events, pictures, related links, mailing list and course descriptions.

Ultrafit Endurance Sports
Company that specializes in products designed for the endurance athlete.

Pacific Association Ultrarunning
Official USATF ultrarunning site for northern California and Nevada. Includes Ultra Grand Prix standings, race calendar, and results.

New York Ultra Running
Contains details about races in the area, highlights, pictures, directions, and membership details.

Extreme Ultrarunning
Resources, links, and general information. Includes runners' profiles, calendar, photographs and race reports.

Australian Ultra Runners' Association
Seeks to promote ultramarathon running in Australia. Provides a race calendar, results, news, and links.

International Association of Ultra Runners
Provides organizational information, newsletters, race listing and coming events, training tips, and links. English and Chinese versions.

Ultramarathon World
News service for runners who compete at distances beyond the standard marathon of 42 kilometres, 195 metres. Source of information on ultramarathon races, runners and activities.

Sri Chinmoy Marathon Team International
Sponsor of multi-day races, including the world's longest certified race of 3,100 miles, triathlons, and many ultra events in more than 30 nations. Includes news, photos, race information, library and links.

Kansas Ultrarunners' Society
Includes event descriptions, member biographies, pictures, newsletters and membership information.

St. Louis Ultrarunners Group
Provides club news and events, including registration materials.

UltraOz
Includes news, links, and race descriptions.

Ultrarunners Organization
Includes descriptions and links to events, photos and contact information.

Sri Chinmoy Marathon Team New York
Multi-day events, including an annual 3,100-mile race. Information on upcoming races and events, articles, and contact information.

The 100km Association
Club serving Britain. Includes news and events, club information, message board, and race results and reports.

Socal Trail Runs
Profile, calendar, gear, links, tours, and travel. Southern California.

Marathon of Britain
News, the team, photographs, faq's, and community.

Cascade Running Club
Hosts 100 mile, 50 Mile and 50K minimalist runs in Washington. Includes club information and race details.

Kevin Sayers UltRunR Site
Resources and opinions on topics ranging from training and racing tips to equipment recommendations.

AC100 RaceBook
The official record and program of the Angeles Crest 100 Mile Endurance Run. Includes course and driving maps for runner and crew. 1986-2001 information.

Will Brown's Umstead 100 Report - 2001
Will Brown conquers the 100 mile distance at the 2001 Umstead 100 Mile Run in Umstead State Park, Raleigh, North Carolina, April 7-8, 2001.

Ultra Adventures
Comprehensive regional ultrarunning resource focusing on North Carolina and the Mid-Atlantic region.

Endurance Sport Club
International organization, based in Canada, that sponsors a number of fat-ass style ultra-races. Includes membership information and race calendar.

Team CRUD (Coloradans Running Ultra Distances)
Ultra trail running information, photographs, news, and links.