I dunno if I'd use the term "Web 2.0" anymore. As for a site with a good UI, I'd look at Quora. It hits all the high marks of UX. Simplicity, speed, ease of us

I dunno if I'd use the term "Web 2.0" anymore. As for a site with a good UI, I'd look at Quora. It hits all the high marks of UX. Simplicity, speed, ease of use. Others will probably disagree, though. As for CSS strategies, look into media queries for responsive design on phones/tablets: http://www.alistapart.com/articles/responsive-web-design/ http://www.alistapart.com/articles/responsive-web-design/