Juxtapoz Art and Culture Magazine contains many contemporary artists or recently discovered artists on the rise. They tend to show very non traditional and creative works which I appreciate. They will generally post all different types of art but their main categories are in in illustration, photo, design, erotica, graphic design, and graffiti art as well as music.
Another site with art similar to those featured on Juxtapoz is called A+
This site deals more with story telling and things going on in life and the world, but many of the articles featured can be great sources of inspiration and imagination.