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A program at http://www.ccc-raab.com/transhstgpx/ converts Garmin's HST ('history') files into GPX ('GPs eXchange') which Google Earth understands (it's just a flavour of XML with a GPX extension).
I'm not sure what else (other than the ForeRunner 301) outputs HST, and in fact that only does so indirectly, via exporting from the Garmin Training Centre, and you have to export the entire history; there's no selection ability, meaning you have to manually edit the HST after exporting if you only want to import a subset of the data to GE.
Not sure if that helps, but.
If you fancy having a play with the Marathon fly-through, here's the GPX file (as yet uncorrected for the bad GPS data). Open it with GE and press the Play triangle in the treeview at the left.
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