Did you install the 10.4.11 combo update for ppc?
my version of iTunes is Version 8 on mac os 10.4.11
You need to download the latest available Safari.
Safari 4.1.3 for Tiger
other browser of interest.
OmniWeb uses the lastest Safari framework. The open source WebKit. Other browsers like Safari and iCab use the OS version of WebKit. The OmniWeb downloaded dmg includes it's own copy of the latest WebKit.
iCab - The Taxi for the Internet
TenFourFox -- It's a port of the latest FireFox to run on older hardware and software.
"World's most advanced web browser. Finely tuned for the Power PC."
-- works for me on 10.4. Supports 10.5
alternative download site: