Scrubbles linked to this fun page, which discusses (and shows some pictures of) restaurant chains that have vanished (or almost vanished...apparently Arthur Treacher's lives on).
Burger Chef was a big part of my Minnesota childhood, primarily because I was a picky kid who didn't like mustard, and they would let you order burgers plain and dress them yourself at their condiment bar.
We also had Arthur Treacher's Fish and Chips, which was about the only chain I knew about that offered fast-food fish. The one near our house turned into a Winchell's Donut shop when the chain started to vanish.
I've heard of Sambo's, but I don't remember ever going to one, and Bob Greene's wonderful memoir "Be True to Your School" is full of memories of he and his friends going to the Toddle House, which was another chain we never had. The other chains are new to me. Minnie Pearl sold chicken? Did she leave the price tags on it?