http://wiki.openstreetmap.org/wiki/Routing/online_routers
http://wiki.openstreetmap.org/wiki/Beginners%27_guide
http://wiki.openstreetmap.org/wiki/FAQ
http://help.openstreetmap.org/
How about the coastline being available everywhere? And Landsat/Bing aerials? 
Or grab a GPS, drive around, open an editor and start drawing. What more do you need to get going?
Well, I’d argue OSM is already there. Does MapMaker give you anything back besides the Google slippy map? Cycle maps? Wheelchair maps? Raw data? Nautical Maps? State of the Map conference with a cool T-shirt? No?
But I’m not going to try to win you over, stay at MapMaker if you’re happy there…