I primary walk or cycle around, tracing small streets, cycle paths/lanes and footways, checking street names, and adding various points of interest. Occassionally I'll get a ride with a friend, and take advantage of the opportunity to map from a car point of view.
If you have spotted errors made by me, please don't hesitate to contact me. You can do that through wiki or my OSM userpage, whichever you prefer. All my edits are done in good faith and I'd hate to repeat the same mistake twice.