MVVM Specifically fits the markup + code and lookless model in WPF and silverlight. I would not suggest it to a winforms app as I believe it would be an overkill. I do not see any benefit over MVP in a winforms app. However in WPF and silverlight it is always the preferred than MVP.
Read up on the web what MVVM is and why it came to be. That should clear it up further.
