GIS & Location Technology Episode 5 - Why use a mashup when you already have a GIS?

Summary: Everyone seems to be taking an interest in mashups. Although the uses are diverse, the common thread is that they use location and maps as a theme, and they provide a simple visual interface for decision support. From a GIS perspective, when would it be desirable to use a mashup? We give an example of landslide hazard analysis in the Bay Area.