Well, if somebody has a website they presumably WANT people to look at it, so I wouldn't think there would be a problem even if they did find out who you were. But I've wondered about this too, whether people can tell if you've been visiting their site and who you are. In some cases I'd rather remain anonymous. It would seem that they could identify the website visitors but they'd have to go to some trouble to do so, so it's unlikely that they would unless there was a very good reason.