Levels by Bakdraft
Bakdraft (a.k.a. INTERNETRACECAR) is a newcomer in the Descent level designer scene, but his creations are of amazing quality. The guy really has a sense of structure and texturing. He has cranked out quite a few levels recently, and each of them holds its own, so he's got his own section in my level spotlight. The levels deserve it.
Click on the images for a visual impression.