OS X 10.3 sports dozens of changes that are immediately evident as one starts working their way through the Preference Pane. Many of changes are logical and welcome with one exception. The Internet Preference Pane has been removed all together!
You will likely remember our old friend, the Internet Preference Pane. That is where you specified the default applications to use web browsing, and email. So far, with my limited time on 10.3, I have found only one way to change the default browser setting. Open Safari and go to the preferences. There, in the General Section, you can set your systems default web browser.
Similarly, if you would like to change your default email client, you must load OS Xs Mail application. There, in the preference, you can then set the default mail client!
It seems a little out of the way to me, but who am I to quibble. From what I have seen so far, Apple has done an outstanding job with the latest build of the operating system. And with all of the improvements and changes, you can bet we will have many more OS Tips and Tricks to come!