Wow, i just got home and i'm surprised to see this thread is still going.
I would like to point some other things that discourage the theory of evolution through random mutations.
To begin with, a mutation isn't even supposed to happen, when it does it's because something went wrong with the dna copying. Though i don't believe in higher designs, i also can't image nature being so incorrect that leaves evolution dependant on mistakes.
But it gets worse; since a mutation is a mistake to start with, it is more lickely that it creates a defective creature other than an enhanced one. STILL assuming it does - notice that chances are growing thinner - and an animal is born with traits that set him superior to the rest of it's species, he still has to breed - chances are growing even thinner because in nature not all animals get to be successfull breeders- but the question is : who will be his partner? Since he is unique, he will have to breed with a REGULAR specimen and therefore spoil those rare genetics (back to zero). If he (By a Long shot) has brothers or sisters that received the same traits, they can breed but will create an inbreed generation that will, most lickely, be unhealthy or even sterile.
The chances of a mutant avoiding premature extinction are slim, much less replacing the entire mother-species.