I am not so sure about Leopard. Oh it'll run ok. However that 32MB GPU is going to slow things down a tad. The overall user experience should be acceptable though.

I'm just not so sure about running Leo with a max of 640MB of RAM and that various apps for the user, plus background apps. I think it would be interesting to see what kind of performance he gets out of it.

Ibooks are nice machines. Someday I would like to own the original 500MHz IceBook. I was always intrigued by their looks and I know a 500MHz G3 is plenty fast for OS 9.