I experience problems with export of my workouts to XML Since 15 August 2009. It applies to both new and earlier workouts. Before, the exports of all workouts were correct, so I believe the problem isn't in the GPS device (Nokia by the way :-)).
The workout starts with many "zero" records, then one record thousands kilometers away of the actual workout, then correct points of the route.
Sample workout from 2008-03-01: http://sportstracker.nokia.com
1) Many zero points
2008-03-01T06:01:55
0.0
0.0
0.0
0.0
2008-03-01T06:01:55
0.0
0.0
0.0
0.0
2008-03-01T06:01:55
0.0
0.0
0.0
0.0
2) One nonsense point (I wish I were so fast...):
2008-03-01T06:01:57
51.8065038012002
0.728314422254369
15.17881027391154
4.415008447049499
3) Many correct points:
2008-03-01T06:02:22
271.30178216943455
5.9948733071072855
50.09022442156403
14.569761740681873
2008-03-01T06:02:56
271.92976886928165
6.4532716236955565
50.090635062906685
14.569397666048811