If you like weapons, vehicles an mechs, you have no excuse but to own this book. Seriously, it is hands down one of the best design and inspiration sources I have ever come across, not to mention it shows you not just the final results, but all the prototype phases they went through during development.
Replies
http://www.wetanz.com/the-art-of-district-9-weta-workshop/from/brand (signed copy)
[ame]http://www.amazon.com/Art-District-Weta-Workshop/dp/0062064304[/ame] (might have trouble getting it, but its cheaper)
A peak as to what's inside!
http://www.google.co.uk/images?q=district+9+art+book&um=1&ie=UTF-8&source=og&sa=N&hl=en&tab=wi&biw=1680&bih=925
http://www.polycount.com/forum/showthread.php?t=81257
http://conceptartworld.com/
http://fuckyeahconceptart.tumblr.com/page/2
http://www.google.co.uk/images?q=chris+cold&um=1&ie=UTF-8&source=og&sa=N&hl=en&tab=wi&biw=1680&bih=925
http://chriscold.deviantart.com/