Christopher,

You seem to have a very good grasp of what's going on. This is only going to get more widespread as time goes by. For better or worse, sRGB is the defacto color space of the internet and that's what most images are, tagged or not. The IE team certainly knows about color management and profiles as IE for Mac has been able to recognize profiles for several years. Why they figured Windows users wouldn't need this also is beyond me but it certainly can't be that hard for them to integrate. For now, PC users are pretty much limited to Safari for profile awareness, unless there's something else new that does it too. The more people that ask for the needed feature the more likely it will come. The first step, of course, is recognizing both the problem and the proper solution, which you've done quite well.