The IPCC (Intergovernmental Panel on Climate Change) reports in the last decade or so have been predicting the potential for a modest sea level rise, and a possibility of more rapid sea level rise after the 21st century. More recent studies, based on new satellite information and on-site observations in Greenland and elsewhere suggest that the rapid sea-level rise scenario may be more likely than previously thought. Note: IPCC climate models do not account for prior instances of rapid sea-level change (source: See link below for Hansen, James.2006."The Threat to the Planet: Actions Required to Avert Dangerous Climate Change").
James Hansen, the head of NASA's Goddard Institute for Space Science (GISS) at Columbia University in the City of New York has made several recent reports that outline the new potenial risks for rapid sea level rise and the remaining human actions that might reduce these risks.
Here is his page of links to these reports:
James Hansen's page