PDPal explores the way we concieve of cities, allowing for an alternative type of cartography, a poetic mapping of space and time. Users create their own maps, and view the maps of other users, commenting on each other's histories and annotations. A virtual community is created through shared memories and communal discussions.

PDPal was co-commissioned by the Walker Art Center and Creative Time and is archived on the Whitney Museum's Artport.

Currently, there are PDPal maps for Minneapolis & St. Paul, MN, and Times Square, NY.