The theme from "UFO" (composed by Barry Grey). It was a TV series created by Gerry & Sylvia Anderson (of Supercar [sweet avatar,
MACAROON 
], Thunderbirds, Fireball XL-5, Stingray, and Space: 1999 fame). I'm sure no one else probably remembers it...
Also the theme from the original Battlestar Galactica. Quite a majestic sounding tune.
The Man From UNCLE theme was cool.
Jonny Quest's theme was pretty jazzy too.
Jeff
P.S. Almost forgot. The theme from Hardcastle & McCormick
:
Drive! (First Season Theme)
Drive, push it to the floor till the engine screams.
Drive, driving like the demon that drives your dreams.
You're on a hard road, nobody cares if you hit the brakes.
You've got to think fast, keep it in gear, one slip is all it takes.
You gotta keep your wheels on the straight and narrow,
If you wanta' survive.
Slow motion man, iron and steel in the palm of your hand.
High flyin' heart, bettin' your life on the state of the art.
Lay down the law. Don't you let 'em cross the line.
Under the hood, got the bad and the good. Everybody's doin' time.
Drive, push it to the floor till the engine screams.
Drive, driving like the demon that drives your dreams.
Drive!