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Two Online GPX File Editors that require registration (free):

 http://trackprofiler.com  http://www.gpxeditor.co.uk

Information and Links to Editors and Resources for working with GPX files (inluding desktop applications):

http://wiki.openstreetmap.org/wiki/Edit_GPS_tracks

Online GPS KML Utilities and Converters:

http://www.gpsvisualizer.com