I've reformatted my iPod recently and added some stuff I had, but didn't listen to much or overlooked.
Usually when people think of Pink Floyd they think of The Wall or Dark Side or even the early Syd stuff but there was this whole period between Syd and Dark Side with albums like the Soundtrack from the Film More, Meddle, Atom Heart Mother, Obscured By Clouds. I'm really enjoying Atom Heart right now.
Likewise for Genesis. Many think of that pop period in the 80's but they have some fantastic albums like Selling England By The Pound and Foxtrot when Peter Gabriel was still in the band.
...any other fans?