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Imagery
Aerial imagery is an important resource for mapping. A combination of airplane flyovers, satellite views, and freely-compiled sources are available in the editor under the 'Background Settings' menu on the left.
By default a Bing Maps satellite layer is presented in the editor, but as you pan and zoom the map to new geographical areas, new sources will become available. Some countries, like the United States, France, and Denmark have very high-resolution, high-quality imagery available for smaller geographical coverages.
Imagery is sometimes offset from the map data because of a mistake on the imagery provider's side - so if you see many roads shifted from the background, don't immediately go to move them all. You can set an offset for imagery by clicking 'Fix alignment' at the bottom of the bottom of the Background Settings UI.