I would like to add that even though humans are still evolving, as is logically necessary if you accept evolution, even of the animals, it is doubtful at this point that we would speciate(?), because that would require reproductive isolation. Had technology not progressed to where it is today, it would be likely that the Native Americans, Africans, and tribal peoples of Australia would have developed into different species separate from what we will eventually evolve into.
Its also possible that the human race may stagnate as far as evolution is concerned, or evolve randomly. Natural selection is not nearly as large of a factor as it used to be... We try as a species to limit it as much as possible because of fear of death. I sometimes wish I had a time machine so that I could go into the future and find out what we become.