Any question answered...

what are the best/ your favourite websites for mapping routes?

ideally:

• will plot a route, with info about roads and cycle lanes (like cycle streets)
  
• can modify the suggested route (like googlemaps)
  
• can draw your own bits eg. for when the website doesn't know there is a cyclepath there
  
• elevation info
  
  

I use http://ridewithgps.com
It does all of the above and you can log miles done (or complete lack of in my case). You can also log rides to the site with GPS data from fancy Garmin devices apparently.