I tried the beta of OmniWeb 4.5. It’s not too bad.
The one feature that stands out to me is “Edit Source” as opposed to the tradtional “View Source”. It’s a great way to try out CSS stuff. The way the location bar searchs through the history is very convenient.
Of course, I can not make OmniWeb my brower of choice until it has tabs. But then the faq informs me that tabs are due in Version 5.