I was recently searching for a CSS Framework. Amongst the ones I found that I believe are popular were Blueprint, 960gs, and YUI. I also searched from the Kohana forums since I was planning to use the CSS framework on trying out Kohana and found BlueTrip. Looked really nice and was quite easy to use (check out its documentation :D) although I haven't much explored it. BlueTrip's definition taken directly from its site: A full featured and beautiful CSS framework which originally combined the best of Blueprint, Tripoli (hence the name), Hartija, 960.gs, and Elements, but has now found a l...