I just downloaded Webkit and I must say, it is incredibly fast. Leopard recognizes it as Safari when you are using it, but that is no matter. The icon looks good and I like the fact that it imports everything that you have in Safari. If Apple upgrades Safari to include some of Webkit's features, then Safari will be the best/fastest browser available.
-BMF

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic