I actually strongly suspect that hybridization far better explains the fossil record. Species show up suddenly without transitional forms, stay relatively unchanged for as long as they endure, and then vanish.

Check out Macroevolution.net (if I remember the name of the site right). The evidence is strong with this one.

I dunno about the 'directed evolution' theory. There's but indirect evidence for it. While most of the evidence we could find would be highly likely to be underwater, since sea level is about as high as it's ever been, you'd think such technology as would be necessary under such a theory would have left some marks.

I see that natural hybridization does occur, and could explain our origin without supposing aliens, or gods, or any unnatural intervention. Clearly, strong physical evidence is necessary for such claims to be superable as fact.