wow, my first edits (from yesterday) have appeared on the mapnik tiles. I removed the decommissioned railway tracks of the Penn Central Railroad in east Urbana, and corrected the length of an alley segment in my neighbourhood (that part of the alley just isn't there, there are fences and back yards, why did it make it into the thiger data anyways).
On a different note, I wonder if there actually is vandalism on OSM, and how tiny but wrong map edits get detected.