In his post MVC or MVP – Whats the difference?, Todd Snyder explain the key benefits and key differences between the MVC (Model-View-Controller) and MVP (Model-View-Presenter) patterns. Both patterns address a key OO principal namely separation of concerns between the UI and the business layers. I found this post interesting and it helped clarify the differences between the MVC and MVP pattern.
There is also a very good description of MVP here: http://www.wildcrest.com/Potel/Portfolio/mvp.pdf. It shows that there are more components in MVP, like Interactor, Selection, Command and Command Set.