I've been threatening this for a while, and had originally thought that I would actually need two separate computers to complete the project. After some consideration, though, I realized that a Sawtooth would actually work perfectly, so out it came. Basically, my plan is to install every PPC version of OS X on the computer. I've managed to put together disks for every version, so it's a matter of just taking the time to do all of the installs. I'm doing this with two hard drives. The first is 80gb, of which 30gb is dedicated to Tiger and the rest is divided up for the various versions of OS X. Since I don't plan on doing serious work in older versions, they are quite content to be on small partitions. I steadily increased the partition size with increasing version numbers, with Public Beta, 10.0, and 10.1 getting 4gb each(remember that this was the size hard drive shipped in many of the computers these were intended to run on, and the install media is a single CD-ROM). The second hard drive is nominally 60gb, with a dedicated 10gb OS 9 partition(I prefer having OS 9 in its own partition as a general rule, and especially with this set up, since I can select it from boot manager) and the remainder(about 46gb) for Leopard. The graphics card in this system is actually the somewhat rare retail Mac edition Radeon 8500. Although this does not support core image, it gives outstanding performance in OS 9 and good performance in everything through Tiger. It's not even half bad in Leopard. The display is a 22" ADC Cinema, connected via an A1006 DVI-ADC adapter to the DVI out on the 8500. RAM, of course, is maxed at 2gb, mostly for Leopard's benefit. I'm still in the(long) process of installing OS X. I actually don't have the 10.0 disks in hand yet(eyougren is very generously sending them to me), and 10.1 will have to wait until 10.0 arrives as the only disk I have for it is the free upgrade that Apple provided. I've been playing with Public Beta this evening on my Yikes! and it is certainly an interesting-albeit unstable-OS...I'll just have to remember to hit the PMU reset should I desire to boot into it on the Sawtooth.