It just works

Installing HP printers (and switching between them) was a pain in Tiger. In Leopard however, it just works; plug it in, and the printer is ready to print immediately. No hunting for driver downloads on the HP website, or hunting for install discs. And certainly no stupid bubbles in the corner of my screen, clicking through "Next...Next...Next" buttons to install drivers like Windows. Plug in. Print. Blog about it. I love this OS and its user experience.