Oldies but goodies - The Mac is not a typewriter and Beyond the Mac is not a typewriter by Robyn Williams. It's not Mac-specific, and both have a lot of example

Oldies but goodies - The Mac is not a typewriter and Beyond the Mac is not a typewriter by Robyn Williams. It's not Mac-specific, and both have a lot of examples of how you can improve design. Fairly eye-opening if you're not used to having a design eye. Even simple things like alignment and grouping related things can have a big impact.