I just open sourced a portion of a perpetually half-finished ClojureScript game. The project uses ClojureScript, canvas, and affine transforms to build an interactive star map. The star map supports panning and zooming (click and drag to pan, scroll in or out to zoom).
The notable bits of the codebase are the canvas namespace and the affine transform namespace. My implementation of the star map was borrowed from an earlier incarnation I once did in Java 2D. I think there's an opportunity for a nice ClojureScript/Clojure library that would accept the same 2D drawing and transform operations for either a browser canvas element or a Java Graphics object.
Anyway...
To see the map in action: http://ashenfad.github.com/stars/
To see the project page: https://github.com/ashenfad/stars