I made my first OSM edits tonight. Mostly, I added cycle paths in my immediate neighborhood, but I also removed two "bad" roads that were in TIGER -- one was really a driveway (so I removed it as a highway), the other was a driveway, but has been upgraded to a residential street and given a name, so I fixed it up and named it.

I intend to start mapping some newer subdivisions in my immediate area soon, along with cleaning up some TIGER data (it still shows old railroads where the Fox River Trail now is, for instance).