Arc Language is a new dialect of LISP being designed by Paul Graham. It is not specifically intended to be a popular language for development in competition with Cee Language and Java Language, but a language for hackers. (See Being Popular Essay) As a successor to both Common Lisp and Scheme Language, 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 Casual Programming.
An update from the International Lisp Conference in Oct. 2003: www.paulgraham.com 
Arc has been released! arclanguage.org
A community-organized fork is more up-to-date: sites.google.com github.com
See original on c2.com