Doing the concept work for The Cartographer at the moment has me enjoying sites like that for the new game Torchlight. The media centre on the game's site has a range of concept graphics. We have rendered drawings with plenty of style and I like the little animations as well (full of all those principles of animation).
[Torchlight concept images via the official site]
The video presents a nice integration of gameplay and the concept art actually - something for me to look at for my coming trailers, esp around Sound.