This may be old news, but I have a person on my buddy list who is on a windows pc using the new AIM for windows. The interesting thing is that an audio icon shows up next to his name on my buddy list. However, it is grayed out, though I am able to right click on the icon. This seems like a major indication that iChat AV / iSight will be compatible with windows (at least on AIM) shortly. I have screenshot available if someone can host it for me.