[jmgrimes]

I wonder if the big players can improve the quality of their maps by implementing wiki-style editing systems like OpenStreetMap.

Google seem to have already started down this path with the Map Maker functionality. http://www.google.com.au/mapmaker

[aw3c2]

Map Maker is not really wiki-style. At least for me wiki means that you get your data out in a more of less raw form. With Map Maker you add vector data and get pictures in return. A drastic reduction in usability to me. You cannot export your data from Map Maker. You only feed Google with it.