Czuch Czuckers: Correct, you can NOT see someone who has you blocked on your Online Opponents List. I discovered that recently. (ME on someone's blocked user list???? I was shocked! lol)

Yes, you can see those people in your Friends list, however, if you have made them a "Friend".

And I just experimented, if they have you blocked they CAN still see you in all the normal places. You can counteract this by adding them to your blocked user list, I suppose. But of course they can still see you on their Friends list if they have you there. (Or maybe they can already see by looking at their blocked user list)