One interesting memory that I still have trouble explaining to people - multiple video modes on the same screen. I remember having a 640x400(ish) 256 color screen, then pulling it down halfway and having a 320x200(ish) workbench screen behind it. "Huh?" is what I usually get. Then "why would you want that?"
It was also only worthwhile as long as multiple resolutions had different tradeoffs in terms of supported palette etc.
On the Amiga you even had paint programs using this to display the image you were editing at one resolution/palette, and the UI / tools etc. in a strip displayed at a different resolution.
