NASA's Interactive Flood Maps
First time accepted submitter jackandtoby writes "Whether you buy into global warming or not, you can have a go at being Charlton Heston and raise sea levels on a biblical scale thanks to NASA's online flood maps. Click away and cause your own Sim Flooding."
It's based on their DEM (digital elevation model) dataset, specifically the Shuttle Radar Terrain Mapping project, but I doubt that they had anything to do with this. There's also an ad at the bottom for flood insurance. It also looks like the guy just went through and generated a blue overlay for land lower than the sea level rise you select, which wouldn't include any backwater effects from going up rivers. He's got a website about what he did here: http://blog.firetree.net/2006/05/18/more-about-flood-maps/
It was not actually done by NASA, and if it was, it would probably not have made a terribly big dent in their budget, seeing as how it was actually done by some guy just for fun.