Tell us about yourself!
You might want to start off next time by describing what the thing is and what it's used for! I found it incredibly irritating that you went straight into the instructable with "So without further ado, let's get building!" and it seems that you are just assuming that everybody in the world knows what an "articulated utility arm" is and what it does. Hope this is a lesson learned!
Very nice. I've been wanting to do this. Just a suggestion, most instructables I've seen include a handy, concise "parts list" placed somewhere all together for easy reference. I realize that all the parts needed are mentioned througout your 'able, but I personally find it helpful to be able to just refer to the parts list rather than having to look back through the whole thing if there is a question as to sizes, quantities, etc.. Thanks.