Today's illogic du jour comes from Shock and Blog.
Apparently, recent work which has found a functional purpose for the human appendix somehow "blows a hole" in the theory of evolution. Or, so "Jason" thinks.
Sadly, he's horrendously mistaken. The claim rests upon the notion that the purpose of the appendix has remained constant over time - hardly something that we can claim is guaranteed.
While we certainly do not need the ability to deal with large amounts of cellulose as our ancestors did, and human beings clearly can live quite well without their appendixes, it does not mean that the appendix is entirely without purpose (even if that purpose was misunderstood previously.
The notion of body parts having "fixed" and immutable uses is demonstrably false when you consider something as simple as bacterial flagellae:
For instance, precursors to the flagellum's motor can be found being used as ionic channels within bacteria, known as the Type III Secretory System. This is true for most of the structure of the flagellum in general; of the 42 proteins found in the flagellum, 40 have already been found in use in different biological pathways.[12
If you want a more specific discussion, this article was pretty clear about pointing out why the idea of static purpose really doesn't hold together so well.
The observation that the appendix now serves as a "refuge" for certain kinds of bacteria that live in our intestines is hardly surprising, nor does it substantively affect the validity of evolution as a scientific theory.
Even more depressing for hard-line creationists is the cold reality that the notion of an organ being "vestigial" ultimately means that the original purpose of the structure is no longer significant. There is nothing to say that the structure no longer has a use in the body. In fact, the observations suggest an intriguing degree of adaptation in the relationship between the body and some of the microorganisms that live within.