The Run Scout is a new site that provides 3D flyovers of race courses ranging from Half-Marathons to Ultramarathons. The site, designed by Jim Vernon, is relatively new, so there is not a lot of content yet, but I imagine that will change with time. Currently, course flyovers are available for such notable races as the Vermont 50, Leadville 100, New York City Marathon, and San Francisco Marathon, as well as several others. Looks like the site has great potential as a resource for distance runners.
Below are direct links to Run Scout flyovers videos:
Visit The Run Scout for more videos like these.
To read more about The Run Scout, view an article from Team Montrail: Visualize Your Next Run with TheRunScout.com