Hey Guys,
The I've just created a google earth file for existing sections of the Ice Age Trail. The file was created by converting the Wisconsin DNR's GIS centerline into google earth kmz format, so it doesn't contain any original work by me. I've read the download/usage agreement for the original GIS data, and I believe posting the google earth file is full compliance, since I have made appropriate citations.
Anyhow, the data might be significantly outdated, sinch the metadata in the original gis file says the creation date is from 1999. I'm not sure about that though.
Here's the link to the GE forum where I've posted the file: Link
--Mr. Parkay