I am seriously considering paying money for OmniWeb. I got tired of the bugs and the hogging of RAM and CPU by Safari. OmniWeb sucks up the RAM too, but it is far nicer to my CPU, works better, and has nicer interface and features.
I'm almost at the end of my trial period and I'm most likely going to break down and buy it (and probably upgrade to OmniGraffle 3 at the same time). I've really gotten used to the thumbnail tab bar and the location shortcuts (pretzel-L "ip" gets me to instapundit, "bleat" to Lileks, . . . ).