I've professed my love for the 80s many times before, but I should also say how much I love the 70s as well. The decade is much maligned, and often for good reason, but I still love the styles, music, and yes, TV. Here is a set of 70s-era commercials and promos from ABC in what I consider the quintessential 70s year, 1977. Heck, ABC can be considered the quintessential 70s TV network. That was the decade they really caught fire and proved themselves a force to be reckoned with alongside CBS and NBC. Enjoy!
For a ton of great 70s-ness, you must check out the Retrospace blog. There is amazing stuff there!