Safari is very nice, still in its beta version though. It's "untagged", which is the main disadvantage to me. Speedwise, try to compare it to Opera 7 for windows, its almost as fast. It has a good css support, nice interface etc. There are more features yet to come, but if it won't be tagged I won't use it. I use Chimera (Boosted), primarily because of its speed and Mozilla, because of everything else. And I can't stand IE because its so bloody slow on macos x and because of the way it caches pages (on any platform).