"... let users write little Arc programs to control the way pages are generated ..." Marc Andreessen has an article that describes how Ning is designed as a "R

"... let users write little Arc programs to control the way pages are generated ..." Marc Andreessen has an article that describes how Ning is designed as a "Runtime Environment" just as you have described ~ http://blog.pmarca.com/2007/09/the-three-kinds.html http://blog.pmarca.com/2007/09/the-three-kinds.html "... I believe that in the long run, all credible large-scale Internet companies will provide Level 3 platforms. Those that don't won't be competitive with those that do, because those that do will give their users the ability to so easily customize and program as to unleash supernovas of creativity. ..." It would be a good way for hackers to develop, share, debug Arc code. Boost the language develpment using the pre-release code.