Snow Leopard *won't* be PPC Compatible.
I think that we have reached the point where we have absolute proof that Snow Leopard will not have PPC Compatibility when it comes to market.
The following Utilities are now Intel Only (not Universal Binaries):
Audio MIDI Setup
Bootcamp Assistant (duh!)
Remote Install Mac OS X
There are also many applications that are now Intel-only, but I think that I have made my point.