1.  A Laptop running one of the 3 supported operating systems in at least a virtual machine if not as the main OS (32/64 bit windows -xp or vista, Mac OSX, Linux)

2.  A thumb drive or a cd with a copy of ColdFusion 9 and ColdFusion Builder Beta 2 to share with your neighbor if they forget it.
     Get it at http://www.adobe.com/products/coldfusion/

3.  Your coolest geek shirt. Don’t have one? you still have time to order one from think geek

4. An Idea of what you want to build or help build. See http://www.cfdevcamp.org/post.cfm/project-ideas and Add your own to the comments

5. Graphic Design software if you’re a designer – Adobe Fireworks works best, someone needs to make the code pretty! Get the trial here.

6. Paper or a notebook for sketching ideas and notes. – Portable whiteboards are cool too.

7. Hacker / devhouse  / excitement to learn / can do spirit  – without this you will have no fun, and at the end of the day I hope that is what you have.

8.  Have a great camp!

Please add more ideas in the comments!