I'm a huge fan of OmniWeb. The latest WebKit absolutely rocks...it's very fast and works with most of the sites Safari stumbles on. However, the vertical tab bar definitely takes time getting used to, especially on small screens. The idea of tab preview is nice, but text is horizontal. In order to get enough viewable tab text, I need to make the drawer bigger than I would like. I know the idea is to use the preview image rather than the text, but with duplicate pages from the same site you can see how this becomes a problem.