Yes, I'm using OSX 10.1.5 right now on my PowerBook G4 Ti I had been using 9.2 and the old, old OSX that came with the Ti was bad (crashing). 10.1.5 and the new 10.2 are much more reliable than 9.2 and any Windows machine. I still haven't upgraded all my programs to OSX based so I still use classic in OSX...but it works well. I use my PowerBook for film editing, and graphic design, and web.

You'll like 10.1.5 or higher.

Shaun