OmniWeb is once again taking the browser where no one else is but that no one else has any excuse not to. Since OmniWeb introduced text boxes in web pages with spellcheck (not that I've been using it, obviously), it's really been on the forefront of what browsers should do. The link above shows some of the newest features, like having each individual site having the potential for having its own preferences.

The browser's last major change since Netscape 3 was dhtml. It's about time the browser and features from some more specialized online access tools were merged.