<iframe width="500" height="400" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="http://www.arcgis.com/home/webmap/templates/OnePane/basicviewer/embed.html?webmap=d612fd2120154531a531b52a3bf7f4a8 &gcsextent=-162.15,9.0935,-59.0543,53.3257&displayslider=true&display scalebar=true&displaybasemaps=true"></iframe><br /><small><a href="http://www.arcgis.com/home/webmap/viewer.html?webmap=d612fd2120154531a531b52a3bf7f4a 8&extent=-162.15,9.0935,-59.0543,53.3257" style="color:#0000FF;text-align:left" target="_blank">View Larger Map</a></small>
I encountered this service recently and decided to give it a shot. www.arcgis.com is the address. This map consists of 3 different .kml files layered together. The service supports shapefiles, .gpx, .csv, and online data services.
Edit: well, I thought with iframe code, it'd work, but I guess not entirely. Too bad. I thought the prospects of displaying multiple .gpx files layered at once onto a map were very good. At any rate, the embed code works well on my website, and you can click the link to view the full map.
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Thread: ArcGIS Online for data viewing