Anyone here edit in OSM regularly? It's the ultimate time and productivity killer. I've been trying it for 3 months now, lots of fun adding stuff before Google Maps gets hold of it. I've mostly been editing route numbers in MD, and adding the new bypasses/interchanges (Hughesville, Hampstead, Frederick). Mostly it's TIGER cleanup though, as data in some counties (Anne Arundel, for one) are especially 'dirty'.
I don't edit OSM/Mapnik but Acme Mapper show OSM/Mapnik by clicking "Mapnik", here the cover of Calgary by OSM/Mapnik
http://mapper.acme.com/?ll=51.045,-114.057222&z=12&t=K&marker0=51.045,-114.057222,Calgary
cover of Calgary by Google Maps
http://mapper.acme.com/?ll=51.045,-114.057222&z=12&t=M&marker0=51.045,-114.057222,Calgary