Idol worship is disallowed in Islam.But why did Mohammad kiss this stone when he cleared the Kaaba of all other idols.Bcoz it was believed to have fallen from Heaven. Secondly, u r wrong when u say muslims stand on that stone. It is placed on the Kaaba & this is the place from where muslims begin what Mr. Sayyed calls the circumambulation round the Kaaba. So, The Kaaba is a stone building covered with a black tarp. On this is the black stone (in a silver enclosure)that apparently broke upon impact. I would say this amounts to idol worship but muslims may disagree. It is a matter of personal belief and faith.
But again where in quran is it mentioned to run around the kabba 7 times and that this is pleases Allah???