Apple stopped development of Safari for PowerPC Macs many months ago, right? Yes, but at least one developer is keeping the flame alive by churning out nightly builds of Leopard WebKit, which runs exclusively on OS X 10.5 PPC Macs — this is the browser for full H.264 and Grooveshark Mobile support.
Apple stopped selling PowerPC Macs back in 2006 with software support dropping off app by app ever since. The most recent Safari update for PPC shipped in July 2011 and no one expects Apple to release another.
Enter Leopard Webkit, which provides builds of current WebKit frameworks for Mac OS X 10.5 (PowerPC only).
Leopard WebKit is a nightly channel build of WebKit for PowerPC macs running Mac OS X Leopard. It is the only PPC browser to support full h.264 and Grooveshark Mobile.
I don’t have a PowerPC to test it on, but expect our friends at Low End Mac have something to say on the subject sooner or later.