Traverse City: http://keepright.ipax.at/report_map.php?zoom=12&lat=44.7707&lon=-85.61808

Chicago: http://keepright.ipax.at/report_map.php?zoom=12&lat=41.88261&lon=-87.63622

http://wiki.openstreetmap.org/wiki/USGS_High_Resolution_Orthoimagery

http://gis.glin.net/ogc/services.php#lmb_mi_inland_lks_polys_dwa
http://www.mcgi.state.mi.us/mgdl/?rel=thext&action=thmname&cid=3&cat=Lake+Polygons
http://wiki.openstreetmap.org/wiki/National_Hydrography_Dataset
http://wiki.openstreetmap.org/wiki/NHD/Basins_East

Add beaches (http://wiki.openstreetmap.org/wiki/Tag:natural%3Dbeach)
Area for NMC
Maps paths in the Commons
Map buildings in the Commons
Bike lanes / routes
Check churches
Add some buildings (http://wiki.openstreetmap.org/wiki/Building) (http://wiki.openstreetmap.org/wiki/JOSM/Plugins/BuildingsTools)

Check road names in the Commons

Relevant wiki articles:

http://wiki.openstreetmap.org/wiki/United_States_Road_Classification
http://wiki.openstreetmap.org/wiki/United_States_roads_tagging

Traverse City road volumes:
http://www.ci.traverse-city.mi.us/images/maps/2006trafficcountmap.pdf

Michigan functional classifications:
http://mdotwas1.mdot.state.mi.us/public/maps_nfc/