Safari 3 beta. It’s pretty snappy in my non-scientific testing. Recommended for those who like speed and excellent web standards rendering. I haven’t tried it on Windows yet.
Thoughts on WWDC 2007 Keynote: Hmmm…interesting but not as revolutionary as past WWDC. But then again, I haven’t seen everything under the hood in Leopard. I think the biggest things are the Quick Look (full previews of documents/files/movies without opening the creator application) and Time Machine (one step, no-think backup and retrieval). Time Machine can be revolutionary if Apple does it perfectly and flawlessly. Of all companies, they certainly have a chance to pull it off.
Update: Running Safari on my work PC shows that there’s a lot of room for improvement. Not snappy. At all. And from the internet there appears to be major internationalization issues because it appears Safari 3 Beta was aimed for the english speaking world only.