Where's a good place to find route maps for long-distance cycling? I'm trying to find the easiest route between Orange County CA & Las Vegas.

Have you tried your local tourist information place?

not LD-specific, but these sites have lots of routes on them:

http://veloroutes.org

http://bikely.com

http://mapmyride.com

Don't know if they have maps for the route you want, but adventurecycling.org has great bike specific maps.

...and a lot of states and counties put out bike maps - either recommended routes (which you could stitch together to get you where you're going), or an area map with roads color coded for cycling suitability.

Scott P
Bend, OR