http://wiki.openstreetmap.org/wiki/Key:highway
LINZ:race_track_use
LINZ:race_track_type
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Glen: We can tag as the proper track:
http://wiki.openstreetmap.org/wiki/Sport
http://wiki.openstreetmap.org/wiki/Tag:leisure%3Dtrack

I checked out Indianapolis Raceway and it is a highway=raceway and lesiure=track. Adding the sport tag as well.
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HB: download preview showed that type=0.0, fixed that. now ready to go AFAICT.
Added area=no as this layer is the centre-line of a course, not the bounds of an area. (leisure=track makes it be treated like an area)
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chathams uploaded april? 2010.
Mainland uploaded 23 Feb 2011 in changeset 7371691 (HB).
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HB 22 Aug 2012: updated linz field names to match what's in the new dataset.