First off the round (-er) buttons. I miss them, it's a sentimental thing, I loved aqua. Second of course the scroll bars. But what I really want back, more than anything - and it's there's a usability issue here is the colour on the finders sidebar, I can't find **** anymore without colour, it takes every time a few extra seconds and a lot of squinting to find them. Oh why, oh why apple did you take the colour away, what a stupid move (one that I don't want argued in this thread, as I argued it ad infinitum in other fora) apple, one going again your own user interface guidelines.