There is a nice repository for the King County, WA, which is quite useful for hiking:
http://gismaps.kingcounty.gov/roadalert/

It has hi-resolution aerial photos and road-alert overlays with URLS like this:

http://gismaps.kingcounty.gov/ArcGIS...le/6/38/49.jpg
http://gismaps.kingcounty.gov/ArcGIS...le/6/38/52.png

Unfortunately, I could not run it inside MM. Any ideas how to do this?