It depends on how old your Powerbook is. If you open up Terminal (Applications -> Utilities -> Terminal) and type "
uname -a" it should say, either "x86_64", "i
X86" - where
X is either a 3, 4, 5 or 6 - or "ppc" somewhere on the line that's printed out.
Fedora does not have a netinstaller - but it does require some network connectivity if you add the Fedora Extras repository (if memory serves me correctly), which it will attempt to set up during install. Fedora only distributes its versions on DVD ISOs. Depending on which processor architecture you have (which will be determined by the output of "uname -a" you download the appropriate DVD ISO.
According to the Fedora project website, Fedora Core 9 is to be released in a little under two weeks - I would wait until then.
