TrainingPeaks

I've not used this - if you have, let me know and I'll add your comments. Has free and premium services, tracks nutrition as well as training.

See Also

• The importance of a training log, which includes a list of logging applications and web sites
• SportTracks - The best training log, with extensible functionality via plugins. This is my top recommendation for serious runners.
• Dailymile - This is my top pick for social logging. Casual runners can use this site as their only training log, or combine it with SportTracks fir more sophisticated analytics.