MachODump is a small console application which reads the headers of Mach-O binary files (executables, object files, ...) and prints them on the screen in a human-readable format. It also includes a preliminary disassembler.
Code for MachODump is in CVS.
PowerPC to i386 recompiler
The recompiler already works with many small test applications and the performance seems to be very good.
Code for the recompiler is in CVS.