omega

http://drupal.org/node/1298692
    Omega http://drupal.org/project/omega
    Context http://drupal.org/project/context
    Omega Tools http://drupal.org/project/omega_tools
    Omega UI (OUI) http://drupal.org/project/omega_ui


http://drupal.org/node/819168
    0px to 740px wide - global.css
    741px to 979px wide - global.css + default.css + narrow.css
    980px to 1219px wide - global.css + default.css + normal.css
    1220px and wider - global.css + default.css + wide.css