Mac OS X 10.2 (jaguar) seems amazing from what I can tell so far. “Feels snappier!”

My 10.2 don’t panic yet list:

• The http.conf file, where all custom domains are stored wasn’t deleted. It was backed up. The location of the previous file is: /etc/httpd/httpd.conf.applesaved
• Classic applications looking for the documents folder are now redirected to the documents folder for the current user. This is a good thing. Move any remaining application tidbits from the root level documents folder into your user documents folder and everything works fine again. (Classic seems much faster.)
• MySQL needs to be reinstalled, but the data is still there. If you want to back it up, copy the files from the /usr/local/mysql/data/ directory. Those are the database source files containing all the data. Marc Liyanage has already released an updated MySQL installer.
• Re-installing MySQL was fairly simple, mostly I followed Marc Liyanage’s update instructions. However step #8 of installing MySQL on 10.2 contains the little note “If you do not want to have to type “/usr/local/bin” in front of every command… you have to add the /usr/local/bin directory to your PATH environment variable in your
  login script.” That sounds scary but it’s not. As mentioned on this page, a ‘.tcshrc’ file is a simple text file which modifies the terminal’s preferences (actually it’s a configuration for the tc shell, which runs in the terminal, this won’t affect the color or window settings used by the Mac OS X terminal application). Using Pico or BBEdit, create a text file and insert the line:
  setenv PATH /usr/local/bin:$PATH
  
  Save the file with the name ‘.tcshrc’ at the top of your user directory “~/” and restart the terminal. Now MySQL should launch by simply typeing “mysql”.

• I’d gotten used to using “l” (lower case L) to list files in the terminal without having to type “ls -l” For some reason, this is gone in 10.2, but it’s easy to replace. Open the same tcshrc file mentioned above, and add the following line:
  

  "alias l 'ls -la'"

  That will re-enable the ‘l’ command and adds the feature of listing everything, including invisible files. To make this change globally, edit the files in the /usr/share/init/tcsh directory instead.