A couple months ago, I went from a 10.4.11 G5 to this 10.6 MacBook Pro, and now none of my PPC apps work. I have re-installed Rosetta twice and they still refuse to function. The ones I have tried are:

Oni Anniversary Edition
Doom 3

So, um... If there's anything I've possibly overlooked, please inform me. Or does it just so happen that every one of the above is 10.6-incompatible?