Apple has released Safari 3.1.1 for both OS X and Windows. I installed it on my two Leopard Macs without a problem through Apple’s Software Update and a reboot was required. It’s also available as a standalone download.
There’s also the standard
…improvements to stability, compatibility…
The reboot displayed a blank blue screen for a nerve-racking length of time but was otherwise uneventful.
[Updated April 17th:] Well, I may have spoken too soon. My iMac was stable until the first reboot after the patch. At that point it wouldn’t finish loading and would lock up shortly after logon. Starting in Safe Boot mode would allow the logon but instability would ensue after running an app or two. The update itself doesn’t seem to be the problem as a new user profile runs Safari and other apps just fine. Also, my MacBook is running fine.