I think Facebook is one of the best-looking sites that's ever been, though the last two redesigns haven't been too tight. The original layout, with the links on the side and the two-column profile, was one of those things that vastly inspired me when I was younger. The level of order it forced on its users was stunning, especially compared to MySpace. Now it's been tuning down some of the things I liked - especially the "How do you know this person" syntax - but it's still more usable than any other site that huge. The fact that people can intuitively figure out how to post photos, videos, events, groups, notes, friend people, fan pages, add applications, all without any advice - my grandfather figured it all out without help - is one of those things that's so impressive that it's easy to ignore because you take it for granted. Meanwhile, a lot of the things that have become common in sites - the thing that stands out to me is the resizing textfields - were first popularly used in Facebook. When I wrote for AllFacebook my main interest was scouring the site, clicking everything I could, looking for those finesses. So it's beautiful in terms of dedication to usability if nothing else.