Here are some web based route planners.

RAC - http://www.rac.co.uk/web/routeplanner/
AA - http://www.theaa.com/travelwatch/planner_main.jsp
Free Trip (US and Canada) - http://www.freetrip.com/
ViaMichelin - http://www.viamichelin.com/viamichelin/int/tpl/hme/MaHomePage.htm
Green Flag - http://www.greenflag.co.uk/routeplanning/index.aspx
Map Blast - www.mapblast.com
Maporama - http://world.maporama.com/idl/maporama//
Tourism Ireland - http://www.map-ireland.com/route/index.asp
Rand McNally (USA) - http://www.randmcnally.com/
Maps on Us (USA) - http://www.mapsonus.com/
Map24 (Global) - http://www.uk.map24.com/