ok, nothing really new here, but I wanted to add that the actual concept art is always quite inspiring, like with the nids, the BTs and today i was looking at the dwarfs, snce i need to convert/paint one for the local GW contest (you wouldnt believe how many kiddies started to cry when I said I would join this...lol...ok off topic...)
The concept art for the Black Templars was also really good, full of great conversion ideas. Stuff that they'd never be able to sculpt for plastic sprues, but is a great freaking idea all the same.
Now I just wish I could sculpt a skull. I should get back to trying that.