I am starting a new project at work where I will be required to use Lisp as a part of some cognitive work that I will be doing. I'm not very familiar with Lisp. Do any of you know of any books that will help me get up to speed quickly?
Practical Common Lisp by Peter Seibel is very popular and available online.
Paul Graham's books on lisp are good: http://www.paulgraham.com/books.html
Paul Graham's books ANSI Common Lisp and On Lisp are really good. On Lisp is free too.
I can second the recommendation for On Lisp, but don't make it the first Lisp book you read. The first part of the book is totally appropriate for relative beginners, but you'll get a lot more out of it if you work through something else first. Both Practical Common Lisp and ANSI Common Lisp have also already been mentioned, and I also highly recommend them. I think ANSI Common Lisp is the best of them for quickly getting a sense of how Lisp "works".
Also, don't just read! The Seibel book link already posted has a link to lispbox, a free and painless-to-setup Lisp development environment.
Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp is good. Don't let the title fool you, it's not all about AI. It's more of a history of AI, showing you how various historically important AI programs could be implemented in Common Lisp from scratch yourself. It has a ton of good general Lisp information that's applicable outside the realm of AI.
The Common Lisp Hyperspec is a useful reference, and it's generally easy to find things in there. Don't try to learn Common Lisp from it, but it may be very handy to have.
Let Over Lambda is a good read. It is more about learning Lisp than learning "Lisp syntax", though, so don't make it your first book.
Not for beginners, in Lisp or programming, but one of the most beatiful book I read about computer programming:
Some links I collected about Lisp
http://delicious.com/ajlopez/lisp