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But bicycle parking is shown on the CycleMap! (some I did http://osm.org/go/eu8Yf@gjl-?layers=C)).

The mapnik layer does not render everything, it is designed to be a mapping style which is cartographically coherent. One of its maintainers is Steve Chilton, President of the British Cartographic society. It is possible to add tickets for additional rendering at trac.openstreetmap.org, but ultimately the decision lies with the maintainers of the Mapnik stylesheet. Steve gave a talk about the things he would like to add at State of the Map 2010, the slides may be on the web somewhere. For a change to be successful, I’d recommend identifying what needs to be added to the Mapnik stylesheet, and attaching a diff on the trac ticket, as well as providing several examples, and preferably an example of the envisaged output.

CycleMap is designed, operated and maintained by Andy Allan: styling and rendering are his choices: it’s his project.

If you are interested in parking there is a map dedicated to the subject: http://parking.openstreetmap.de/

In the main the maps on the OSM web-site are meant to illustrate what can be done with the OSM data, rather than provide a definitive ‘official’ map.