Awful seems to have come a long way since I last looked at it: http://wiki.call-cc.org/eggref/4/awful. Anybody used it in production?
http://paste.call-cc.org/ is awful-based. My home page (http://parenteses.org/mario/) is also in awful, but it's nothing fancy.
It's been ported to CHICKEN 5, by the way: http://wiki.call-cc.org/eggref/5/awful