Some favourites

Vital Hands Sports Massage
The Himalayas 100 Mile Stage Race
The Yukon Arctic Ultra
The Rock and Ice Ultra
The Libyan Challenge
The Swiss Alpine Marathon
The Grand Union Canal Race
Marathon des Sables official website
Marathon des Sables UK representative
Jungle Marathon
TransAlpine Run
Raid Montpellier
Verdon Trail
Thames Meander
Steve Partridge
TwinTimes - the blog
Mens Fitness
Runners World
Eventrate
Runfurther