I've now updated oceantiles_12.png with inland lake data for all of western Canada. The lake detection seems perfect -- I've been re-rendering lakes Winnipeg, Manitoba, Winnipegosis, Dauphin, and That-Other-One-I-Can't-Remember-The-Name-Of, and they look much better now that the holes are filled in. The islands don't render inside-out any more either. I also fixed one bad piece of coastline. I'm still waiting on svn access so that I can get the updated oceantiles data and my laketracer script checked in.