Start patching - I updated a few hours ago...
Safari 3 buggy and slower than Firefox 3 beta tooGARGANTUAN OS X UPDATE FIXES ALMOST 100 SECURITY FLAWS
SEVERITY: HIGH
18 March, 2008
SUMMARY:
* These vulnerabilities affect: OS X 10.4.x (Tiger) and OS X 10.5.x
(Leopard), both client and server versions
* How an attacker exploits them: Multiple vectors of attack,
including enticing one of your users into visiting a URL or web site
* Impact: Various results; in the worst case, attacker executes code
on your user's computer, potentially gaining complete of your user's
computer
* What to do: OS X administrators should download, test and install
Security Update 2008-002:http://tinyurl.com/2r3nbd
Today, Apple released a security update fixing thirteen security issues in Safari 3 for OS X and Windows. The worst of these vulnerabilities potentially allows attackers to execute malicious code on your Safari user's machines. If you use Safari in your network -- whether on a PC or Mac -- you should update to version 3.1 as soon as you can. Some of the fixed vulnerabilities include:
-Webkit buffer overflow vulnerability
-Safari certificate spoofing vulnerability
-Multiple XSS vulnerabilities in Safari
http://docs.info.apple.com/article.html?artnum=307563