Can iSight camera be used with a PC?

Hi. I have an iSight camera mounted on one of my computers, and one that is built into my laptop. I was thinking I might give the standalone iSight to my sister, who is a PC user, so that we can do video chats using appropriate IM software. Is it possible for her to use the iSight camera with a PC that is FireWire ready, if she is able to find a workaround driver?