For the time being I've decided to devote my time to learning Mapnik. So far it's a daunting task. My goal is to acquire the skill necessary to produce maps that are actually useful to residents of and visitors to the corner of Thailand in which I reside. I'll continue to carry my GPS when I'm out and about and upload tracks of unmapped areas. But, until I master Mapnik, data gathering expeditions have become a low priority.