I've been an avid follower of Joel Friedlander's monthly ebook cover contest for over a year now. It's a great resource for finding amazing designers and seeing what works (or doesn't work) on a book cover. I finally took the plunge a few weeks ago and entered my three covers. I was hoping for a positive comment (he doesn't hold back if he doesn't like what he sees) but never hoped to win a gold star (like being back at school!)
You can check out the other amazing covers entered in the January contest here. My Nomad Series is half way down the post.