Interstate Interchange Browser - Uses Google Maps to locate every interchange on the system. Includes exit numbers where available. - http://www.m-plex.com/roads/cmap/int/
North American Roadguides - Commercial exit service listing for various Interstates. Includes maps. - http://www.roadguides.com/
The U.S. Interstate Highway Strip Chart Project - Strip maps with information from signage plus other information. Requires XSLT translation. - http://home.comcast.net/~andytom/Highways/index.html
The Freeway Lists Page - Many locations around the country. - http://mryamamoto.50megs.com/freeway-lists.htm
Traveling in the Northwest - Coverage of most of the lengths of Interstate 5 and Interstate 90 throughout the country. - http://www.northwestplaces.com/trip-all.htm