patoX is an 'enabler' that allows to install your Final Cut Pro applications on your PowerPC G3! patoX won't install without the Final Cut Pro applications; it's just an enabler. You must to have Final Cut Pro, or you will need to buy it, in order to use patoX.
I made an installer for patoX, and you can download it [904KB] if you'd like to try it out.
[robg adds: I haven't tested this one, but I have been asked about FCP apps on G3s before, so maybe this will help a couple folks out...]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20040917201440403