Better than many of the openings you had:

All in the Family - http://www.youtube.com/watch?v=2hO239D5ljs (Honestly the most iconic opening of any American show)

Welcome Back Kotter - http://www.youtube.com/watch?v=WMyC9dKjkrI

Mannix - http://www.youtube.com/watch?v=D_1Ax4vliO8

The Saint - http://www.youtube.com/watch?v=phvZf6EHac4

Batman! - http://www.youtube.com/watch?v=IQBobrCBTNI

Magnum, P.I. - http://www.youtube.com/watch?v=_VIPlG8Xtq8

Police Squad - http://www.youtube.com/watch?v=FLXyC1cuN3M

Three's Company - (Couldn't find online, but come on!)

Quincy - http://www.youtube.com/watch?v=08cXyrDewlQ&mode=related&search=

Odd Couple - http://www.youtube.com/watch?v=2be6jGwLoJ0

Laverne and Shirley -http://www.youtube.com/watch?v=6mVKUpT4g5k (wave bye bye to the beer)

Star Trek

Doctor Who (any season, any Doctor)

and of course, the best opening credits ever - Twilight Zone - http://www.youtube.com/watch?v=NzlG28B-R8Y

Not that I am biased, but clearly one of the best opening sequences ever -- the answering machine messages, that montage of still photos, the fantastic music...

The Six Million Dollar Man: awesome opening credits.

Honorable mention, on top of all the others mentioned in the letters: Kolchak, the Night Stalker.

The Prisoner had both a classic opening sequence and a classic closing sequence.

The opening to Babylon-5 was a good one, I always thought.

The Simpsons opening is good, yes, but it's of course a takeoff on The Flintstones, which is itself a takeoff on The Honeymooners. (Not that I personally think that the opening of The Honeymooners is classic . . .)

I always like the opening of Baretta, myself. And S.W.A.T. may have been an execrable show, but it had a pretty kickin' theme song. For the 70s, anyway. And finally, the trumpet flourish of The . . . F . . . B . . . I . . . was always one I liked.

And yeah, I was born before 1980. 'Way before.

but to me they all pale in comparison to the bass line from the theme to Barney Miller:

http://www.youtube.com/watch?v=wAh5SJrIEwY

Bet you can't listen just once!

http://youtube.com/watch?v=0Si6YLWRS9A

Depicting a normal morning as some sort of violent bondage/murder scene just by exaggerating the details is brilliant. I can't think of an opener that fit its show better than this.

You're all mentioning your favorite TV series. You're descending into trivia. Better you should ask, why are so few modern TV series doing this?

For the last ten years or so TV networks and syndicators have been trying to squeeze more and more money out of the shows, adding more commercial time. This also includes promos on networks for their other shows. "Setting a mood" has been replaced by "getting the gelt."

As a result, instead of setting a comfortable mood for whatever show you're watching, the TV show is shoved into your lap almost immediately, like a dog or a baby about to crap. It's like being forced to watch auditions of performers; no set-up, no life story like they did in A Chorus Line, just the raw "do your thing." In effect, show producers have made us suffer the same kind of hell they go through when creating a show, and the same pain of performers having to audition.

It's not the main reason, but it's one of the contributing factors about why television has become really uncomfortable to watch in the 21st Century.

Oh...by the way, have you heard the music inside TV shows? Long way from "Johnny" Williams and Henry Mancini. Or even Billy Joel's contributed songs on Moonlighting. There's always some sandy-haired, underpaid female wailing a lament in the background every time someone dies on Grey's Anatomy and some awful hippie folksinger dude speaking lyrics you can't understand over the love scenes on Smallville. And I bet these poor performers did these songs on specs because "your song will be on TV where millions of people will hear it." Yeah, if you can hear it behind the gushing blood and the sucking sound of people kissing.