ArcLanguage is a new dialect of LISP being designed by PaulGraham. It is not specifically intended to be a popular language for development in competition with CeeLanguage and JavaLanguage, but a language for hackers. (See BeingPopularEssay) As a successor to both CommonLisp and SchemeLanguage, it is intended to correct most if not all of the perceived flaws of both, and is meant particularly to be a small, kernel-based language which can be easily used for CasualProgramming?.
http://www.paulgraham.com/arc.html
An update from the International Lisp Conference in Oct. 2003: http://www.paulgraham.com/ilc03.html
Arc has been released! http://arclanguage.org
A community-organized fork is more up-to-date: http://sites.google.com/site/arclanguagewiki; http://github.com/arclanguage/anarki