Runner's World Online
Dr. Pribut's Sports Injuries Page: Pain = no gain.
Compute your VO2Max with the Team Oregon Pace Wizard
And compute a bunch of other stuff with the X-Country Analysis page
Hal Higdon's On the Run column
John Bingham's The Penguin Chronicles
Foot Motion in Running

The DRS Homepage
Home of the Dead Runner's Society, a fantastic runners mailing list
Orienteering Homepage
Hiking, Navigating, Bushwacking, and Running COMBINED!
The MagnaWave Zone
Download RunTrak 1.20 for Windows 95 & NT! A great running log!