The new Leopard GUI versus the old Tiger GUI in regards to titlebars. (Tiger on the top, Leopard on the bottom) I felt like the corners Leopard had a smaller radius on them than Tiger did, so I checked, and they do.
Small detail, doesn’t really matter. I feel like a pretty big geek for noticing without seeing them side-by-side.
Actually, true geeks will get out the screen ruler to measure the two. That would be worth a mention! ;-p