Found another mailing list. MAPS-L:

MAPS-L Maps and Air Photo Systems Forum is an international discussion forum for Librarians dealing with cartographic information, cartographers, remote sensors, geographers, and cartomaniacs of all types. The subject that ties everything together is cartographic information in all its forms, formats and uses.

Topics discussed include anything related to map libraries, cartographic information, remote sensing systems, geography and cartomania in general.