Identifying PowerPC applications that will not work on OS X releases beyond Snow Leopard? I understand the issue with migrating away from the Snow Leopard release of OS X to anything newer is that applications compiled for the PowerPC architecture will no longer function.

Is there a way to identify applications that are PowerPC-based without opening each and every application and looking at Activity Monitor? It would be great to know in advance which ones need updating so I can check if they've been recompiled for the x86 architecture.
I don't have a Snow Leopard install handy but this info is available in System Profiler...

Apple Menu > About > More Info

In the resulting app there should be a way to view the installed applications.  In that list there will be a column "Kind" that will state "Intel", "Universal" or "PPC".

Screen shot of how this looks in Mountain Lion: (may look different in Snow Leopard, but idea is the same.)