When Safari 1.3 came out, several plugins broke and were quickly fixed again. That’s cool, but both the PithHelmet and AcidSearch plugin updates were a bit rushed (and with good reason because they were high in demand).
However, PithHelmet had a more serious problem. Attempting to set the display of a page element to none after probing the dimensions of that object caused Safari to crash. Mike Solomon has a much better writeup for those technically inclined. Basically what this meant for an end user was that Safari crashed… a lot. It bit me with one site in particular. He issued an update which no longer crashes Safari, but unfortunately doesn’t collapse a lot of blocked elements either (which was one of my main beefs with how OmniWeb handles ad-blocking). It doesn’t happen all the time though, so it’s not going to force me into using Camino or Firefox (for now), but it’s a silly bug that hopefully will get fixed.