Have been working over the past couple of months in the West Pymble area. Note that sometimes east of Ryde Rd is referred to as West Gordon. Most of this was done using OSMTracker on my android phone while riding my bike. Stopping to take photos of street signs, parks etc. Then using JOSM and Potlach editor to edit/amend existing data and upload to OSM.
Before I started, nearly all street names were missing in the area. So, have been focussing on adding street names. Also added streets missing from maps and adding parks, fire trails and paths where noticed.
I think I'm done here (pats self on back).