The sandboxing provided by NaCl is nice, but I'm not sure binary portability is really a worthwhile goal -- I think we really want cross-compilation, native bin

The sandboxing provided by NaCl is nice, but I'm not sure binary portability is really a worthwhile goal -- I think we really want cross-compilation, native binaries and the OS providing most of the sandbox. That way we get maximum performance on the hardware we're targeting (not the "lowest common denominator" of common bytecodes), an ability to run self-modifying code if we want to send a JIT down the wire...