Two musts for any runner:
The most comprehensive running log on the Web
http://www.running2win.com/
And the best way to track mileage
http://www.gmap-pedometer.com/
http://www.runnersworld.co.uk/general/rws-race-time-predictor/1681.html For estimating a race pace.
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http://www.runnersworld.co.uk/general/rws-race-time-predictor/1681.html
For estimating a race pace.