7.5 works perfectly fine. I have an unlocked phone on Rogers in Canada. iToner works as well!
16GB Black iPhone 3G
Synced with a 15" MacBook Pro 2.0GHz Intel Core Duo
There are reports of iNdependence being broken with iTunes 7.5. I'd certainly hold off from upgrading for the moment until this is all verified
Argh, it's because the update replaces the AppleMobileDevice.dll file.
Just download an old version off the .dll and you're off.