I'm actually pleasantly surprised by Tiger on the Pismo, it's a no frills proper OS X, unlike Lion on the MacBook which is beginning to have a Windows-like feel with all the decisions the OS makes on the user's behalf, and all the fancy extras.

If I ever get some sort of G4 processor for it I'm probably not going up to Leopard if it gets stuck on graphics editing - unbelievably I tried installing PhotoShop CS3 yesterday and it seems to be working fine.

Cheers

Hugh