WebKit r39960 with Safari 3.2.1 on Windows XP SP3 crashes when visiting Microsoft Exchange sites (because of broken certificates).
Can you provide a link to a site where I can reproduce this? A crash log would also be incredibly useful: <http://webkit.org/quality/crashlogs.html>.
Confirmed with the r40098 nightly on XP with Safari 3.2.1. To reproduce - go to <http://angel.jjc.edu/> and click "Continue" on the invalid certificate sheet. Crash dump shortly.