Very true. Since it has been x86 specific from the start, that will be hard to do. PNaCl is trying to get there, by making LLVM architecture-agnostic, but it's

Very true. Since it has been x86 specific from the start, that will be hard to do. PNaCl is trying to get there, by making LLVM architecture-agnostic, but it's an experiment at this point. And even if it does end up working some day, it may or may not get into other web browsers than Chrome, not to mention iPhones. Personally I suspect JavaScript (or a subset of it) will get to the speed of native code sooner than we can run native code in a cross platform way in most of our browsers.