There are several members who have their various graphics hosted on there. In terms of who can get infected, I don't think we need to worry about it, unless viruses will start transferring themselves even if you are simply seeing an image that sits on an infected website. That being said, clicking to unlock the many pages on MLK that are blocked automatically gets very annoying very quickly.
Of course, I run Linux, so my chances of getting infected are about 0.00000001%, even if MLK itself was infected.