For what it's worth, PowerPC is totally obsolete and there were not that many 32-bit only Intel Macs shipped before they switched to the Core2. I think you would do fine supporting only 64-bit x86 on 10.5 and 10.6. That should cover everything back to Fall 2006, i.e. 0-4 year old machines, and at least 2/3 of all Macs in use. Remember that many old machines will simply *never die*. They will be used for ssh and browsing the web until their components fail. Anyone doing computations will probably have a newer machine.
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