It looks like the QEMU wiki is being organized into folders. I'm thinking the page http://wiki.qemu.org/Documentation/Platforms/ should be a listing of all the platforms QEMU currently supports. The list would be links to their respective pages. Example:
Platforms available in QEMU: ARM i386/x86-64 MIPS OpenRISC Power PowerPC Sparc 68K Thoughts/suggestions/additions?
