Safari 4 as my main, but before this Firefox 3. I occasionally step into the realm of Google chrome 2. I didn't like Safari 3. It didn't run very quick on my Vista machine, but after hearing Apple's speed claims I thought I'd try it again and it really is pretty quick, so I'm using it. I'm not sure if my love of my image zoom and adblocker firefox ad ons (the only ad ons I REALLY care about) will make me switch back, but we'll see. I'm liking Safari 4 so far.