Hardly "junk" in my opinion. More like Retro Treasures!
This is a site I came across that has some great old commercials, movie trailers and opening sequences to a ton of old TV shows too. The site categorizes everything by era, (70's, 80's or 90's) and alphabetically as well. I've barely scratched the surface, there's alot of stuff to see here. As an example, Click "TV Shows", click on an era, click "Alphabetical" and then choose a show and click "Show Opening".
Prepare to waste some time here! Click on the image to be taken to the site.