If I remember correctly, when Steve-all-mighty-Jobs showed off leopard, he said that it would include 'The Whole Package' of PhotoBooth and FrontRow. So, once leopard comes out, you should be able to press [apple, esc] and have it open up.
Sorry about having to wait, though! There might be a faster way.
and I have actually resisted 10.4.8 on both my 12" PB 1.5ghz and the mini 1.5ghz PPC -- running 10.2 and 10.7 respectively -- because of the constant fan issues.
ive had it running on g4 machines but its far too much effort, every os and itunes update mean you have to reactivate it and its just too much trouble, buy an alternative, theres a few out there.