* TIGER
all sorts of interesting reasons why it's bad data, but it's a start
* MN Data
state and county data sources and how to integrate them when there's existing data
* Real Time
5 minutes changes published, clients check for changes in area
table note whenever data is downloaded (but with flag to indicate client -- josm vs t@h)
* Visual Diff
it would be nice
* Barrier To Entry
multi-tier editing. simple reporting facility and custodians georss feed ("geo extension to trac")