I have decided to install Tux Paint in the computer lab this year. I am going to use it in test mode and decide if it will make a good replacement for Kid Pix. Unfortunately, Kid Pix is operating very poorly on Snow Leopard (10.6).
Download and Installation
The download and installation are quick and easy. I go directly to the Apple Mac OS X Tux Paint Download page. One key is to download both the program and the extra stampers.
Configuration
An additional key step is running the configuration program. I have found, from the installation on the Windows XP tablet PCs, it pays to configure the system to Always Save New Picture under the Save Over Earlier Work category. I place a check mark in the Start Blank section. Finally, I place a checkmark in the Use Alternative Save Directory in the Save Directory category. I browse to the Document folder. Tux Paint created a Saved folder within Documents. All of these settings are on the Saving tab of the configuration program.

Next I go to the Video/Sound tab. I adjust the window size to fit the screen above the dock. On the tablet PCs I set the program to adjust to full screen.
Ideas To Test
My biggest concern is the lack of folders and the ability to use pre-made templates similar to those I prepared for the Idea Machine in Kid Pix. I think if I'm careful with a file naming convention I might be able to still have templates. I'll have to see how things are sorted when I open files. I'd like the youngest student's work to appear first on the list.
Additionally, I may have to teach the students to rename their files. Right now Tux Paint assigns the date and time stamp as the file name.
I know a few teachers who use Tux Paint. I'll have to reach out to see what best practices are already in use around the world.