Created attachment 68375 [details] crash log Configuring settings in Dreamhost's control panel when Webkit quit unexpectedly. Since updated to last version (67838), it has also quit when configuring settings in Gmail and other Google Apps. Some tabs with flash may have been open at those times, but I am using ClickToFlash version 1.6b9 to disabled it (latest beta). I also have a few extensions enabled but none have been a problem since this latest build. I hope this information can help. Thanks!
Created attachment 68377 [details] Crash Log 2
Just updated to Safari 5.0.2 (for some strange reason this Mac mini had not been updated) but the problem persists. Webkit just beach-balled on me when opening an email on Google Apps GMail.
Could you please try with the latest nightly build? This sounds like bug bug 46077, which has been fixed recently.