http://www.freemaptools.com/measure-distance.htm
Handy google map that has a ruler. Drop points on the map and it calculates a running total of the distance between them.
http://weatherbonk.com/
Weather route planning, pretty awesome stuff... :-)
http://www.railmaps.com.au/
Rail Map Australia has a great route planner which plots routes across buses / trains and different companies. Very helpful.
http://maps.yellowpages.co.za/
Yellow Pages provide the (currently, Jan 08) best available online mapping service for South Africa while Yahoo Maps, Google Maps, etc appear to have no street level data.