The Omni Group released beta 1 of OmniWeb 4.5 sometime recently (I think, I'm not quite sure when it came out). This one is special because it uses Apple's WebCore. So remember how slowly OmniWeb used to render pages, it is much better now (though still feels a little sluggish, but that might be because I'm eating up tons of bandwidth with bittorrent at the moment). The one issue... no tabs. I never realize how much I use them until I don't have them. Now I just wish Safari let me tweak all the options OmniWeb does. (Release notes and known issues can be found here.)