Q: What should I read next to expand my knowledge of Lisp?
A: One of the main uses of Emacs Lisp is to manipulate text buffers and such. After all, Emacs is supposed to be primarily a text editor, after all... To learn how to do this kind of stuff, be sure to check out An Introduction to Programming in Emacs Lisp - You can read the entire book online or buy a printed copy from the Free Software Foundation!
As for Lisp in general, there are many great (and some downloadable) Lisp books available at the CLiki web site. If you're interested in the most intense theoretical text, we would recommend the free ebook version of On Lisp by Paul Graham. The other books he has written and the essays on his web site are also fantastic.
If you're interested in a more pragmatic tack, many Lispers are currently excited about the book Practical Common Lisp by Peter Seibel. Some chapters of this book are available online.
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