Got some data? Want to make an interactive web map? Sure, you can rely on some point-and-click application for an automatic (and sub-optimal) solution--but what fun is that? No, you're here because you are a do-it-yourselfer who wants to know how to get the most design flexibility and make the coolest possible mash-up. This session will get you going with a lightning start-to-finish example using the open-source Leaflet mapping library that knocks the GUIs out of the game.