Marathon and Beyond
Published six times a year - website contains tables of content, sneak previews and ordering information.
http://www.marathonandbeyond.com/

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.
http://www.halhigdon.com/ultramarathon/ultramarathon2000.htm

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

American Ultrarunning Association
Membership details, race listing, USA National Ultra Team, description of the organization and related links.
http://www.americanultra.org/

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

New York Ultra Running
Contains details about races in the area, highlights, pictures, directions, and membership details.
http://www.newyorkultrarunning.org/

Extreme Ultrarunning
Resources, links, and general information. Includes runners' profiles, calendar, photographs and race reports.
http://www.extremeultrarunning.com/

Australian Ultra Runners' Association
Seeks to promote ultramarathon running in Australia. Provides a race calendar, results, news, and links.
http://www.coolrunning.com.au/ultra/

International Association of Ultra Runners
Provides organizational information, newsletters, race listing and coming events, training tips, and links. English and Chinese versions.
http://www.iau.org.tw/

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.
http://www.srichinmoyraces.org

St. Louis Ultrarunners Group
Provides club news and events, including registration materials.
http://www.stlouisultrarunnersgroup.net/

UltraOz
Includes news, links, and race descriptions.
http://www.ultraoz.50megs.com/

Cascade Running Club
Hosts 100 mile, 50 Mile and 50K minimalist runs in Washington. Includes club information and race details.
http://www.cascaderunningclub.com/

Kevin Sayers UltRunR Site
Resources and opinions on topics ranging from training and racing tips to equipment recommendations.
http://www.ultrunr.com/

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.
http://www.geocities.com/ac100racebook/index.html

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.
http://www.geocities.com/madeads/will01-100.html

Ultra Adventures
Comprehensive regional ultrarunning resource focusing on North Carolina and the Mid-Atlantic region.
http://www.ncultra.org

Team CRUD (Coloradans Running Ultra Distances)
Ultra trail running information, photographs, news, and links.
http://www.teamcrud.com/

Multidays.com
Resource for multi-day events with calendars, news, results, and training information.
http://www.multidays.com

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

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.
http://www.srichinmoyraces.org/us/