David A Hardy at www.astroart.org
One of Britains leading space artist - nuff said! Oh, I designed Dave's Web site as well!

Dr. Mark Garlick at www.space-art.co.uk
Superb space imagery from an astronomer. Also some surrealistic stuff.

Claire Smith at www.cthisspace.com
Digital space art and also some superb pencil sketches - take a look at the Clint Eastwood picture