grassrootsmapping - balloon and kite-mapping specific list. Lots of healthy overlap with publiclaboratory
Lists for announcing/coordinating local events and meetups, and asking for local help. These are shown as options upon registering at PublicLaboratory.org. Some consistency in spam handling, joining policy, and naming will be very helpful as the # of local lists grows.
Also we want to just be careful not to let research-related conversations fragment. Each list should have at least one moderator who's responsible for spam and/or willing to say "Wow! Please take this extremely interesting conversation to the main publiclaboratory list!"