A number of people have written in either asking for help with a 10.3.9 Safari crash, or with hints to solve such crashes. So I thought I'd just write one hint with the explanation of the cause and the easy fix.
Basically, if Safari is crashing for you in 10.3.9 (or after any future system update), and you've eliminated the usual suspects such as a bad preferences file, it's likely caused by an "input manager" add-on that you have installed. For instance, both AcidSearch and Saft use the Input Manager interface -- and their pre-10.3.9 versions will cause Safari to crash.
To fix the crashes, first find out what you might have installed. You can find the Input Managers in a number of locations:
Mac OS X Hints
http://hints.macworld.com/article.php?story=20050418070304105