The link should have been to http://cons.io
See Freenode #gerbil-scheme for active development and help. So far it is very nice and about twice as fast as sbcl.
Do you run items in CL that return to an emacs buffer?
Like say, slime-eval/run? Or are these just run in the repl itself and displayed there? Been toying with making some async stuff run via swank/slime and then display in emacs in a custom mode and buffer.