Here's a PDF comparing the latest chipsets. Looks like the 9600 definitely packs more of a wallop than the 9200. However, it would appear that it
beats the GFX Go 5200, however some of the 12" AlBook's architectural advantages may compensate. Also, these are PC benchmarks, the chips may peform differently with Mac drivers. ATi typically has the advantage since they've been supporting the Mac longer.
I would expect the G4 iBooks to equal or slightly best the latest TiBook revision. I'm sure
BareFeats,
MacSpeedZone or one of the Mac mags will post results of more thorough testing once they can get a hold of a test unit...