Here is our club's street-o site:
http://street.orienteering.com.au/
There is a lot more detail about in its pages than on the state association site:
http://www.vicorienteering.asn.au/parkstreet/
There is a lot of variety in the way we run our events.
Most events use numbered metal plates chained to trees, posts etc as the controls. Card punches attached to the plates. The training events we run don't use control plates at all - the control sites are electric light poles and the competitor just writes the pole number on their control card. However we do put a lot of effort in to produce accurate maps, usually drafted on OCAD. But you could get away with regular street maps.
Events are usually scatter-o. Mass start, no defined routes to find the required number of controls out of the 20 on the map.
Street-o started as a summer evening orienteering competition for bush orienteers when it is too hot to go out into the bush/forest during the day. Many participants would now consider it to be their principle sport/recreational activity.