I (Alan Brenner) have built these binaries using rpm5. The Leopard binaries have all four architectures (i386, x86_64, ppc, ppc64), so Apache should run correctly and natively on every 10.5 system.

You should only need one set of: the binary rpm, OS X installer pkg files, or tar.bz2 files. You will need all of the files of the same type.