Microsoft do (did?) the same thing with PocketPC development. Their emulator ran natively, as would any apps (which also had to be compiled natively to x86 for

Microsoft do (did?) the same thing with PocketPC development. Their emulator ran natively, as would any apps (which also had to be compiled natively to x86 for the emulator), but you'd then switch to ARM/MIPS/SH3 for release.