I have been considering using Lisp one day, but I was discouraged by the lack of syntax. So I have created my one homoiconic syntax for my purposes. It has lists, but also tuples and records, and what can be most interesting for you - it has syntactic sugar, which I think can be adapted in Arc or in any other Lisp. If you are interested how I have solved it, have a look at:
http://harpoon.sourceforge.nethttp://harpoon.sourceforge.net/sugar.html
