Midsomer Murders and early episodes of Taggart.

Browsing through Total Television by Alex McNeil, 2nd Edition, I found the following that I don't think have been previously reported:
America's Town Meeting
Gillette Cavalcade of Sports (Friday night boxing)
Your Show of Shows
The Name of the Game
NBC Wednesday Night Mystery: Faraday, The Snoop Sisters, Tenafly

I was looking through this and a lot of the 90 minute stuff is here. Some I remember
The Big Valley - ABC
Lancer - CBS
ABC TV Movie of The Week-
This listing shows that the majority of them were for 90 minte slots with run times of 73 or 74 minutes - http://www.imdb.com/search/keyword?keywords=abc-movie-of-the-week
One of the best ones on the list at 75 minutes - http://www.imdb.com/board/10065657/?ref_=fn_al_tt_1 - Dr. Cook's Garden
Playhouse 90 - CBS - live 90 minutes usually
The Virginian -ABC
NBC Mystery Movie Series - all of them were 90 minutes when they started, even Rod Serling's Night Gallery which was one of the rotation early on, and Columbo, McMillan & Wife, Banacek, McCloud, Hec Ramsey, etc The NBC Mystery Movie was an "umbrella title" for one of many mystery series shown on a rotating basis in the same time slot on Sunday nights. The original three series featured were Columbo (1971), McMillan & Wife (1971) and McCloud (1970). Later, several other (often short-lived) series were added to the rotation including Hec Ramsey (1972), Amy Prentiss (1974), McCoy (1975), Quincy M.E. (1976), and Lanigan's Rabbi (1976). The "wheel" concept proved so popular that NBC started a second night on Wednesdays, featuring Banacek (1972), Cool Million (1972), Madigan (1972), Faraday and Company (1973), Tenafly (1973), and The Snoop Sisters (1972).
Later installments of some of these became 2 hour shows, or in the case of Night Gallery 30 and 60 minute shows. The first ones started at 90 minutes.
A Smile is priceless and Can Be Addicting

90 Bristol Court (Mondays 7:30-9) was actually the umbrella title for 3 NBC sitcoms: Karen, Harris Against the World and Tom, Dick and Mary. The last two got cancelled mid-season, Karen remained for a full year and 90 Bristol Court was all over.

Wallander
http://www.imdb.com/board/11178618/?ref_=fn_al_tt_1

The change of networks, the extra 30 minutes added, and adding color in the bargain just about killed
Wagon Train
. It never recovered from those changes even when they tried to bring it all back home the next season.
Cimarron Strip
was an excellent series, well worth seeking out. Its episodes, and I've only seen a handful, are of feature film quality, as are their production values.

The Men was an hour-long series, as I remember, and Robert Conrad, who starred in Assignment: Vienna, was well-known at the time. Banacek was the survivor of the NBC Wednesday Mystery Movie, not Madigan, and The Snoop Sisters wasn't really like Murder, She Wrote from what I remember. Viewere in the 1970s must have been a lot smarter than Professor_feather, because there was nothing confusing about the rotation of the original NBC Mystery Movie, which was on Wednesdays at 8:30 during the first season before moving to Sundays the following season.
Other 90-minute series:
Wagon Train for one season (in color)
Cimarron Strip
Je suis Charlie Hebdo.

That's right. Thanks. I remember the Sunday night NBC lineup the best. It had legs, and
Columbo
was the standout hit of the three 90 minute shows.
Shaft
struck me as ill-timed, coming too soon after the movie; while
Hawkins
just plain struck me as a bad idea. Good in theory maybe, but it looked like something that wasn't going to fly. Those ABC shows were more intrigue-based, as I recall; not that I watched them, but that's how they were marketed. They looked expensive, too, and their star players weren't all that well known at the time.

Yes. I don't remember these shows, but the Brooks/Marsh book tells me it was mostly NBC experimenting with 90-minute rotation series. The one that lasted was their Mystery Movie, usually on Sunday and usually a rotation of Columbo, McCloud, and McMillan and Wife.
Madigan was part of a Wednesday rotation with Cool Million and Banacek. That must have flopped, because the next year only Madigan survived, rotating with Tenafly, Faraday and Co., and The Snoop Sisters, which sounds a lot like Murder, She Wrote.
Shaft was on CBS, rotating with Hawkins and movies. ABC tried it with Assignment Vienna, Delphi Bureau, and Jigsaw. TV movies were very popular at the time, but it must have been confusing for viewers trying to find one of these shows.
formerly ProfessorAndro

That's right. Roy Scheider starred in one. Wasn't the Richard Widmark
Madigan
another?

Yes, there was a wave of them in the early 1970s.
Shaft
(the series) was another.
formerly ProfessorAndro

Arrest And Trial
, 1963-54.
The Name Of The Game
, 1968-71.
I'm not sure if these mystery series from the 70s counts as shows in the usual sense,
Columbo, McCloud, McMillan & Wife
as they're arguably more like TV movies.

The Virginian
(1962)television's first 90-minute Western series, though in syndication the episodes were usually edited down to one hour.
I'll leave it stand, though I just noticed you mentioned this one in your OP.
50 Is The New Cutoff Age.

Sherlock.
Do you even know what honor is?

• A horse.

Full episodes of Top Gear (UK) came out to 90 minutes on American TV. After the premieres, they were cut down to an hour for re-runs.

• What are you gonna do, when the world catches on?