Having just written about a need for rapid database prototyping, along comes a beta version of something from Microsoft called Visual Studio Lightswitch. Now, it's not so much focused on model-based data prototyping, but it is configured for very fast data-driven application design and implementation. It's a great idea, though I'm not totally sure it belongs as a separate application. Perhaps the niche they're trying to fill is one step above Access but below fully-custom code.
Mokalus of Borg
PS - This is more like rapid user interface development for databases.
PPS - I assume the name is meant to imply the simplicity of switching on a light.