Arthur C. Clarke's
Childhood's End was made into a TV miniseries.
Of course, Universal Studios did some rewriting on it, and renamed it "V".
I'll also mention most of the Michael Crichton catalog:
The Andromeda Strain
The Terminal Man
Jurassic Park
Sphere
Rising Sun
Congo
Disclosure
The Lost World
Timeline
Eaters of the Dead (The 13th Warrior)
The Great Train Robbery