Div structure.
I'm excited about CSS again. After experimenting with making layout-from-scratch apps with WebGL/Three.js in an attempt to avoid the sprawl (and creating my own mini-sprawl in the process) I'm rethinking approaches.
I'm interested in making applications where users customize with their own CSS. My bet is that if we get the initial primitives right, this could allow users to truly customize and feel at home in their spaces.
I keep bouncing off ideas for the next Constraint Systems thing, this isn't quite it... but maybe near.
Some early work on integrating css.gui with Sprout. Getting cautiously excited about the possibilities here.