As a scientist, I use a mix of Incanter, Quil, and gg4clj bridge to R's ggplot2 for visualization in clojure (none of these outputs to a browser though).

R's ggplot2 beats Incanter (or anything other charting library) by a large margin in its excellent mix of conciseness and power, but I find Quil pretty nice for animations (superimposing data on geographical maps, for example).

I keep an eye out for new charting libraries coming out for clojure. Last two I spotted were vizard from yieldbot (https://github.com/yieldbot/vizard), and what seems to have only been a small project, xvsy (https://github.com/dvdt/xvsy)