Dipping my toe into the world of Mac...
Final Cut Studio 2 - The installer claims not to work under Lion, as PowerPC code is no longer supported. However, the installation can be done at the command line using
sudo installer -package /Volumes/Final\ Cut\ Studio/Installer/FinalCutStudio.mpkg/ -target /
I suspect that other packages which fail to install because of PowerPC code could be installed the same way. There is the possibility of installing Rosetta, but that's been removed from Lion. Various forum posts elsewhere say that Rosetta can be installed from the 'optional' components of earlier releases of OS X, but my install disks (10.5.5) don't appear to allow it. This was the workaround which worked for me.
Considering I've been a MBP* owner for ooh, about 36 hours now, I seem to be making progress. I'll see whether it sticks...
*Secondhand, 15" 2.53GHz Core 2 Duo MBP from 2008 with 4GB RAM, 320GB HDD and 250GB external 2.5" USB HDD and a few other goodies: Used, but not abused.