Learning a Lisp

So I'd like to learn a Lisp. What dialect should I use? I believe Common Lisp is the most widely used one. And what about books, online tutorials?

>>13
what do you mean wtf? all syntax in Lisp is nothing more than Lisp functions, adding syntax to Lisp is nothing more than loading a file of functions.
http://inst.eecs.berkeley.edu/~scheme/