-Already some time ago, I traced the village I usually spend my holidays from Yahoo imagery

-To aid this, I programmed the first version of the "Orthogonalize" action in JOSM to replace the more restricted "Make Rectangular". Orthogonalize has improved a lot by others since my first draft.

-Found the map with German labels on http://toolserver.org/~osm/locale/de.html and provided name:de for some thousand Russian cities, using the German Wikipedia as a reference

-Found OSM Inspector http://tools.geofabrik.de/osmi/ and fixed maybe a thousand self-intersecting ways in Germany and some other places I have more or less connections to. Working on this introduced me thouroughly into relations and multipolygons.

-Found http://www.netzwolf.info/kartografie/osm/time_domain/map_opening and began fixing wrong opening_hours etc tags and collection some more from places I know.

-When I saw that my old hometown Lörrach has very good and well aligned Bing imagery, I began correcting streets, tracing power lines and now do buildings. Almost halfway through. It is a nice way of remembering old times while looking at todays Bing imagery and remembering how it was 30 years ago in some places.
http://www.openstreetmap.org/?lat=47.6128&lon=7.6769&zoom=14&layers=M

I'm basically an armchair mapper, but there is plenty to do...