Arnie Swekel
Brian Despain
Daren Bader
Mark Cavotta
Sam Wood
Todd Lockwood
Tony DiTerlizzi
Joel Thomas (recent D&D artist AFAIK, but his work in Races of Stone is the best of the book, see my current "bored, frustrated gnome" avatar).
And...
Rolland Barthélémy
Not a D&D artist, but his gorgeous black & white art in Rêve de Dragon made it the Most Beautiful RPG of the Whole Galaxy (tm).