This article is good to get an idea what lisp is all about.
http://www.defmacro.org/ramblings/lisp.html
It compares lisp to XML. In that you are programming in a tree. Other languages must be parsed into a tree by the compiler, but with lisp you are already there from the get go.
Programming in a tree is the "magic" that's unique to lisp. And it is a big deal.