LightSwitch is optimized to combine data+screens idea by providing developers with tools to not only connect to an existing database, but also create database, tables and associated screens.
Visual Studio LightSwitch Beta will be available on August 23. Come back at that time to download it, plus check back before then for additional LightSwitch videos.
However, a very good preview/introduction is blogged by Jason Zander detailing development using LightSwitch.