Group similar objects on each desktop

I currently have 4 explorer windows, one music player, two word documents and three excel documents on my main desktop.
It would be great if all the explorer windows were grouped as one (with the number 4 written on it), the word documents were grouped as one (with a "2") and excel as one ("3"), and a mouseover would show the actual documents (drop down menu, picture beside the dropdown as you move your mouse over each...)
Does this make sense?
Groped, if i put my mouse over the excel-icon, I get a dropdown (up?) menu telling me there are three documents (and their names if any), and if I move my mouse over any of the names, I see the same small picture I see now of the document...