Looking at xkcd and www.google.com, I don't see tooltips My system is: Windows XP SP2 Safari 3.0.1 WebKit-SVN-r24872 Toshiba Tecra M5 T2400 @ 1.83HGz 987 MHz, 1.49 GB of RAM
Not confirmed. Using r25258 I see tooltips on mentioned sites.
I think it was fixed with this monday's nightly. Thanks, team!