Anyone else running
TenFourFox?
I haven't had that much experience with it yet, but so far I'm impressed. It is stable, it works my banks and the MS Outlook web interface, and it feels just like running Firefox 5 (which doesn't support PowerPC), except it feels faster than Firefox 3 on my iBook 1.07. (TenFourFox is Altivec accelerated.)
Interestingly, you can't run Firefox and TenFourFox at the same time. I get an error message saying you can only run one version of Firefox at a time. I guess Firefox sees TenFourFox as Firefox.