No Chrome for PPC. Stainless if you have leopard is Chrome like (hence the name) in that tabs run as separate processes. Not sure if it has been updated recently ( I only run Tiger).
After never hearing of 'Stainless', I thought I'd try it out, urns out it's absolutely awesome and I'm now using it as my main browser on my PowerBook!
It's kind of a hassle to do, but Chrome does work under Virtual PC 7 running Windows XP on my G5. VP7 works pretty good with my 2ghz (dual core, not DP) machine. Netflix & Silverlight didn't work though, but I didn't mess around with it too much.